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1234 lines
134 KiB
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<p class='location'>Struct KEY_FILE_DESKTOP_KEY_VERSION</p><div class="block items"><ul><li><a href="#deref-methods">Methods from __Deref<Target=&'static str></a></li><li><a href="#implementations">Trait Implementations</a></li></ul></div><p class='location'><a href='index.html'>glib</a></p><script>window.sidebarCurrent = {name: 'KEY_FILE_DESKTOP_KEY_VERSION', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<h1 class='fqn'><span class='in-band'>Struct <a href='index.html'>glib</a>::<wbr><a class="struct" href=''>KEY_FILE_DESKTOP_KEY_VERSION</a></span><span class='out-of-band'><span id='render-detail'>
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<pre class='rust struct'>pub struct KEY_FILE_DESKTOP_KEY_VERSION { /* fields omitted */ }</pre><h2 id='deref-methods'>Methods from <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html" title="trait core::ops::deref::Deref">__Deref</a><Target = &'static <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>></h2><div class='impl-items'><h4 id='method.len' class="method"><span id='len.v' class='invisible'><code>fn <a href='#method.len' class='fnname'>len</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
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<div class='docblock'><p>Returns the length of <code>self</code>.</p>
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<p>This length is in bytes, not <a href="primitive.char.html"><code>char</code></a>s or graphemes. In other words,
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it may not be what a human considers the length of the string.</p>
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<h1 id='examples' class='section-header'><a href='#examples'>Examples</a></h1>
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<p>Basic usage:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="string">"foo"</span>.<span class="ident">len</span>();
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">3</span>, <span class="ident">len</span>);
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<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="string">"ƒoo"</span>.<span class="ident">len</span>(); <span class="comment">// fancy f!</span>
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">4</span>, <span class="ident">len</span>);</pre>
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</div><h4 id='method.is_empty' class="method"><span id='is_empty.v' class='invisible'><code>fn <a href='#method.is_empty' class='fnname'>is_empty</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
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<div class='docblock'><p>Returns <code>true</code> if <code>self</code> has a length of zero bytes.</p>
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<h1 id='examples-1' class='section-header'><a href='#examples-1'>Examples</a></h1>
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<p>Basic usage:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">""</span>;
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">is_empty</span>());
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<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">"not empty"</span>;
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<span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">s</span>.<span class="ident">is_empty</span>());</pre>
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</div><h4 id='method.is_char_boundary' class="method"><span id='is_char_boundary.v' class='invisible'><code>fn <a href='#method.is_char_boundary' class='fnname'>is_char_boundary</a>(&self, index: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code><div class='since' title='Stable since Rust version 1.9.0'>1.9.0</div></span></h4>
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<div class='docblock'><p>Checks that <code>index</code>-th byte lies at the start and/or end of a
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UTF-8 code point sequence.</p>
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<p>The start and end of the string (when <code>index == self.len()</code>) are
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considered to be
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boundaries.</p>
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<p>Returns <code>false</code> if <code>index</code> is greater than <code>self.len()</code>.</p>
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<h1 id='examples-2' class='section-header'><a href='#examples-2'>Examples</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">"Löwe 老虎 Léopard"</span>;
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">is_char_boundary</span>(<span class="number">0</span>));
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<span class="comment">// start of `老`</span>
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">is_char_boundary</span>(<span class="number">6</span>));
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">is_char_boundary</span>(<span class="ident">s</span>.<span class="ident">len</span>()));
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<span class="comment">// second byte of `ö`</span>
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<span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">s</span>.<span class="ident">is_char_boundary</span>(<span class="number">2</span>));
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<span class="comment">// third byte of `老`</span>
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<span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">s</span>.<span class="ident">is_char_boundary</span>(<span class="number">8</span>));</pre>
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</div><h4 id='method.as_bytes' class="method"><span id='as_bytes.v' class='invisible'><code>fn <a href='#method.as_bytes' class='fnname'>as_bytes</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&[</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
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<div class='docblock'><p>Converts a string slice to a byte slice.</p>
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<h1 id='examples-3' class='section-header'><a href='#examples-3'>Examples</a></h1>
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<p>Basic usage:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">let</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="string">"bors"</span>.<span class="ident">as_bytes</span>();
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">b"bors"</span>, <span class="ident">bytes</span>);</pre>
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</div><h4 id='method.as_ptr' class="method"><span id='as_ptr.v' class='invisible'><code>fn <a href='#method.as_ptr' class='fnname'>as_ptr</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.pointer.html">*const </a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
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<div class='docblock'><p>Converts a string slice to a raw pointer.</p>
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<p>As string slices are a slice of bytes, the raw pointer points to a
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<a href="primitive.u8.html"><code>u8</code></a>. This pointer will be pointing to the first byte of the string
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slice.</p>
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<h1 id='examples-4' class='section-header'><a href='#examples-4'>Examples</a></h1>
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<p>Basic usage:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">"Hello"</span>;
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<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">as_ptr</span>();</pre>
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</div><h4 id='method.get' class="method"><span id='get.v' class='invisible'><code>fn <a href='#method.get' class='fnname'>get</a><I>(&self, i: I) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&<I as <a class="trait" href="https://doc.rust-lang.org/nightly/core/slice/trait.SliceIndex.html" title="trait core::slice::SliceIndex">SliceIndex</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/slice/trait.SliceIndex.html#associatedtype.Output" title="type core::slice::SliceIndex::Output">Output</a>> <span class="where fmt-newline">where<br> I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/slice/trait.SliceIndex.html" title="trait core::slice::SliceIndex">SliceIndex</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>>, </span></code></span></h4>
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<div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>str_checked_slicing</code>)</div></div><div class='docblock'><p>Returns a subslice of <code>str</code>.</p>
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<p>This is the non-panicking alternative to indexing the <code>str</code>. Returns
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<a href="option/enum.Option.html#variant.None"><code>None</code></a> whenever equivalent indexing operation would panic.</p>
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<h1 id='examples-5' class='section-header'><a href='#examples-5'>Examples</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="string">"🗻∈🌏"</span>;
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">"🗻"</span>), <span class="ident">v</span>.<span class="ident">get</span>(<span class="number">0</span>..<span class="number">4</span>));
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">v</span>.<span class="ident">get</span>(<span class="number">1</span>..).<span class="ident">is_none</span>());
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">v</span>.<span class="ident">get</span>(..<span class="number">8</span>).<span class="ident">is_none</span>());
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">v</span>.<span class="ident">get</span>(..<span class="number">42</span>).<span class="ident">is_none</span>());</pre>
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</div><h4 id='method.get_unchecked' class="method"><span id='get_unchecked.v' class='invisible'><code>unsafe fn <a href='#method.get_unchecked' class='fnname'>get_unchecked</a><I>(&self, i: I) -> &<I as <a class="trait" href="https://doc.rust-lang.org/nightly/core/slice/trait.SliceIndex.html" title="trait core::slice::SliceIndex">SliceIndex</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/slice/trait.SliceIndex.html#associatedtype.Output" title="type core::slice::SliceIndex::Output">Output</a> <span class="where fmt-newline">where<br> I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/slice/trait.SliceIndex.html" title="trait core::slice::SliceIndex">SliceIndex</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>>, </span></code></span></h4>
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<div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>str_checked_slicing</code>)</div></div><div class='docblock'><p>Returns a unchecked subslice of <code>str</code>.</p>
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<p>This is the unchecked alternative to indexing the <code>str</code>.</p>
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<h1 id='safety' class='section-header'><a href='#safety'>Safety</a></h1>
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<p>Callers of this function are responsible that these preconditions are
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satisfied:</p>
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<ul>
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<li>The starting index must come before the ending index;</li>
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<li>Indexes must be within bounds of the original slice;</li>
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<li>Indexes must lie on UTF-8 sequence boundaries.</li>
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</ul>
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<p>Failing that, the returned string slice may reference invalid memory or
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violate the invariants communicated by the <code>str</code> type.</p>
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<h1 id='examples-6' class='section-header'><a href='#examples-6'>Examples</a></h1>
|
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<pre class="rust rust-example-rendered">
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<span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="string">"🗻∈🌏"</span>;
|
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<span class="kw">unsafe</span> {
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"🗻"</span>, <span class="ident">v</span>.<span class="ident">get_unchecked</span>(<span class="number">0</span>..<span class="number">4</span>));
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"∈"</span>, <span class="ident">v</span>.<span class="ident">get_unchecked</span>(<span class="number">4</span>..<span class="number">7</span>));
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"🌏"</span>, <span class="ident">v</span>.<span class="ident">get_unchecked</span>(<span class="number">7</span>..<span class="number">11</span>));
|
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}</pre>
|
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</div><h4 id='method.slice_unchecked' class="method"><span id='slice_unchecked.v' class='invisible'><code>unsafe fn <a href='#method.slice_unchecked' class='fnname'>slice_unchecked</a>(&self, begin: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, end: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
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<div class='docblock'><p>Creates a string slice from another string slice, bypassing safety
|
||
checks.</p>
|
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<p>This is generally not recommended, use with caution! For a safe
|
||
alternative see <a href="primitive.str.html"><code>str</code></a> and <a href="ops/trait.Index.html"><code>Index</code></a>.</p>
|
||
|
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<p>This new slice goes from <code>begin</code> to <code>end</code>, including <code>begin</code> but
|
||
excluding <code>end</code>.</p>
|
||
|
||
<p>To get a mutable string slice instead, see the
|
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<a href="#method.slice_mut_unchecked"><code>slice_mut_unchecked</code></a> method.</p>
|
||
|
||
<h1 id='safety-1' class='section-header'><a href='#safety-1'>Safety</a></h1>
|
||
<p>Callers of this function are responsible that three preconditions are
|
||
satisfied:</p>
|
||
|
||
<ul>
|
||
<li><code>begin</code> must come before <code>end</code>.</li>
|
||
<li><code>begin</code> and <code>end</code> must be byte positions within the string slice.</li>
|
||
<li><code>begin</code> and <code>end</code> must lie on UTF-8 sequence boundaries.</li>
|
||
</ul>
|
||
|
||
<h1 id='examples-7' class='section-header'><a href='#examples-7'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">"Löwe 老虎 Léopard"</span>;
|
||
|
||
<span class="kw">unsafe</span> {
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"Löwe 老虎 Léopard"</span>, <span class="ident">s</span>.<span class="ident">slice_unchecked</span>(<span class="number">0</span>, <span class="number">21</span>));
|
||
}
|
||
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">"Hello, world!"</span>;
|
||
|
||
<span class="kw">unsafe</span> {
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"world"</span>, <span class="ident">s</span>.<span class="ident">slice_unchecked</span>(<span class="number">7</span>, <span class="number">12</span>));
|
||
}</pre>
|
||
</div><h4 id='method.split_at' class="method"><span id='split_at.v' class='invisible'><code>fn <a href='#method.split_at' class='fnname'>split_at</a>(&self, mid: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a>&<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a></code><div class='since' title='Stable since Rust version 1.4.0'>1.4.0</div></span></h4>
|
||
<div class='docblock'><p>Divide one string slice into two at an index.</p>
|
||
|
||
<p>The argument, <code>mid</code>, should be a byte offset from the start of the
|
||
string. It must also be on the boundary of a UTF-8 code point.</p>
|
||
|
||
<p>The two slices returned go from the start of the string slice to <code>mid</code>,
|
||
and from <code>mid</code> to the end of the string slice.</p>
|
||
|
||
<p>To get mutable string slices instead, see the <a href="#method.split_at_mut"><code>split_at_mut</code></a>
|
||
method.</p>
|
||
|
||
<h1 id='panics' class='section-header'><a href='#panics'>Panics</a></h1>
|
||
<p>Panics if <code>mid</code> is not on a UTF-8 code point boundary, or if it is
|
||
beyond the last code point of the string slice.</p>
|
||
|
||
<h1 id='examples-8' class='section-header'><a href='#examples-8'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">"Per Martin-Löf"</span>;
|
||
|
||
<span class="kw">let</span> (<span class="ident">first</span>, <span class="ident">last</span>) <span class="op">=</span> <span class="ident">s</span>.<span class="ident">split_at</span>(<span class="number">3</span>);
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"Per"</span>, <span class="ident">first</span>);
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">" Martin-Löf"</span>, <span class="ident">last</span>);</pre>
|
||
</div><h4 id='method.chars' class="method"><span id='chars.v' class='invisible'><code>fn <a href='#method.chars' class='fnname'>chars</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/nightly/core/str/struct.Chars.html" title="struct core::str::Chars">Chars</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
||
<div class='docblock'><p>Returns an iterator over the <a href="primitive.char.html"><code>char</code></a>s of a string slice.</p>
|
||
|
||
<p>As a string slice consists of valid UTF-8, we can iterate through a
|
||
string slice by <a href="primitive.char.html"><code>char</code></a>. This method returns such an iterator.</p>
|
||
|
||
<p>It's important to remember that <a href="primitive.char.html"><code>char</code></a> represents a Unicode Scalar
|
||
Value, and may not match your idea of what a 'character' is. Iteration
|
||
over grapheme clusters may be what you actually want.</p>
|
||
|
||
<h1 id='examples-9' class='section-header'><a href='#examples-9'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">word</span> <span class="op">=</span> <span class="string">"goodbye"</span>;
|
||
|
||
<span class="kw">let</span> <span class="ident">count</span> <span class="op">=</span> <span class="ident">word</span>.<span class="ident">chars</span>().<span class="ident">count</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">7</span>, <span class="ident">count</span>);
|
||
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">chars</span> <span class="op">=</span> <span class="ident">word</span>.<span class="ident">chars</span>();
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">'g'</span>), <span class="ident">chars</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">'o'</span>), <span class="ident">chars</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">'o'</span>), <span class="ident">chars</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">'d'</span>), <span class="ident">chars</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">'b'</span>), <span class="ident">chars</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">'y'</span>), <span class="ident">chars</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">'e'</span>), <span class="ident">chars</span>.<span class="ident">next</span>());
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">chars</span>.<span class="ident">next</span>());</pre>
|
||
|
||
<p>Remember, <a href="primitive.char.html"><code>char</code></a>s may not match your human intuition about characters:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">y</span> <span class="op">=</span> <span class="string">"y̆"</span>;
|
||
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">chars</span> <span class="op">=</span> <span class="ident">y</span>.<span class="ident">chars</span>();
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">'y'</span>), <span class="ident">chars</span>.<span class="ident">next</span>()); <span class="comment">// not 'y̆'</span>
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">'\u{0306}'</span>), <span class="ident">chars</span>.<span class="ident">next</span>());
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">chars</span>.<span class="ident">next</span>());</pre>
|
||
</div><h4 id='method.char_indices' class="method"><span id='char_indices.v' class='invisible'><code>fn <a href='#method.char_indices' class='fnname'>char_indices</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/nightly/core/str/struct.CharIndices.html" title="struct core::str::CharIndices">CharIndices</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
||
<div class='docblock'><p>Returns an iterator over the <a href="primitive.char.html"><code>char</code></a>s of a string slice, and their
|
||
positions.</p>
|
||
|
||
<p>As a string slice consists of valid UTF-8, we can iterate through a
|
||
string slice by <a href="primitive.char.html"><code>char</code></a>. This method returns an iterator of both
|
||
these <a href="primitive.char.html"><code>char</code></a>s, as well as their byte positions.</p>
|
||
|
||
<p>The iterator yields tuples. The position is first, the <a href="primitive.char.html"><code>char</code></a> is
|
||
second.</p>
|
||
|
||
<h1 id='examples-10' class='section-header'><a href='#examples-10'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">word</span> <span class="op">=</span> <span class="string">"goodbye"</span>;
|
||
|
||
<span class="kw">let</span> <span class="ident">count</span> <span class="op">=</span> <span class="ident">word</span>.<span class="ident">char_indices</span>().<span class="ident">count</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">7</span>, <span class="ident">count</span>);
|
||
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">char_indices</span> <span class="op">=</span> <span class="ident">word</span>.<span class="ident">char_indices</span>();
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>((<span class="number">0</span>, <span class="string">'g'</span>)), <span class="ident">char_indices</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>((<span class="number">1</span>, <span class="string">'o'</span>)), <span class="ident">char_indices</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>((<span class="number">2</span>, <span class="string">'o'</span>)), <span class="ident">char_indices</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>((<span class="number">3</span>, <span class="string">'d'</span>)), <span class="ident">char_indices</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>((<span class="number">4</span>, <span class="string">'b'</span>)), <span class="ident">char_indices</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>((<span class="number">5</span>, <span class="string">'y'</span>)), <span class="ident">char_indices</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>((<span class="number">6</span>, <span class="string">'e'</span>)), <span class="ident">char_indices</span>.<span class="ident">next</span>());
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">char_indices</span>.<span class="ident">next</span>());</pre>
|
||
|
||
<p>Remember, <a href="primitive.char.html"><code>char</code></a>s may not match your human intuition about characters:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">y</span> <span class="op">=</span> <span class="string">"y̆"</span>;
|
||
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">char_indices</span> <span class="op">=</span> <span class="ident">y</span>.<span class="ident">char_indices</span>();
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>((<span class="number">0</span>, <span class="string">'y'</span>)), <span class="ident">char_indices</span>.<span class="ident">next</span>()); <span class="comment">// not (0, 'y̆')</span>
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>((<span class="number">1</span>, <span class="string">'\u{0306}'</span>)), <span class="ident">char_indices</span>.<span class="ident">next</span>());
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">char_indices</span>.<span class="ident">next</span>());</pre>
|
||
</div><h4 id='method.bytes' class="method"><span id='bytes.v' class='invisible'><code>fn <a href='#method.bytes' class='fnname'>bytes</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/nightly/core/str/struct.Bytes.html" title="struct core::str::Bytes">Bytes</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
||
<div class='docblock'><p>An iterator over the bytes of a string slice.</p>
|
||
|
||
<p>As a string slice consists of a sequence of bytes, we can iterate
|
||
through a string slice by byte. This method returns such an iterator.</p>
|
||
|
||
<h1 id='examples-11' class='section-header'><a href='#examples-11'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="string">"bors"</span>.<span class="ident">bytes</span>();
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">b'b'</span>), <span class="ident">bytes</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">b'o'</span>), <span class="ident">bytes</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">b'r'</span>), <span class="ident">bytes</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">b's'</span>), <span class="ident">bytes</span>.<span class="ident">next</span>());
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">bytes</span>.<span class="ident">next</span>());</pre>
|
||
</div><h4 id='method.split_whitespace' class="method"><span id='split_whitespace.v' class='invisible'><code>fn <a href='#method.split_whitespace' class='fnname'>split_whitespace</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/nightly/std_unicode/u_str/struct.SplitWhitespace.html" title="struct std_unicode::u_str::SplitWhitespace">SplitWhitespace</a></code><div class='since' title='Stable since Rust version 1.1.0'>1.1.0</div></span></h4>
|
||
<div class='docblock'><p>Split a string slice by whitespace.</p>
|
||
|
||
<p>The iterator returned will return string slices that are sub-slices of
|
||
the original string slice, separated by any amount of whitespace.</p>
|
||
|
||
<p>'Whitespace' is defined according to the terms of the Unicode Derived
|
||
Core Property <code>White_Space</code>.</p>
|
||
|
||
<h1 id='examples-12' class='section-header'><a href='#examples-12'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">iter</span> <span class="op">=</span> <span class="string">"A few words"</span>.<span class="ident">split_whitespace</span>();
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">"A"</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">"few"</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">"words"</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">iter</span>.<span class="ident">next</span>());</pre>
|
||
|
||
<p>All kinds of whitespace are considered:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">iter</span> <span class="op">=</span> <span class="string">" Mary had\ta\u{2009}little \n\t lamb"</span>.<span class="ident">split_whitespace</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">"Mary"</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">"had"</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">"a"</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">"little"</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">"lamb"</span>), <span class="ident">iter</span>.<span class="ident">next</span>());
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">iter</span>.<span class="ident">next</span>());</pre>
|
||
</div><h4 id='method.lines' class="method"><span id='lines.v' class='invisible'><code>fn <a href='#method.lines' class='fnname'>lines</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/nightly/core/str/struct.Lines.html" title="struct core::str::Lines">Lines</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
||
<div class='docblock'><p>An iterator over the lines of a string, as string slices.</p>
|
||
|
||
<p>Lines are ended with either a newline (<code>\n</code>) or a carriage return with
|
||
a line feed (<code>\r\n</code>).</p>
|
||
|
||
<p>The final line ending is optional.</p>
|
||
|
||
<h1 id='examples-13' class='section-header'><a href='#examples-13'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">text</span> <span class="op">=</span> <span class="string">"foo\r\nbar\n\nbaz\n"</span>;
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lines</span> <span class="op">=</span> <span class="ident">text</span>.<span class="ident">lines</span>();
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">"foo"</span>), <span class="ident">lines</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">"bar"</span>), <span class="ident">lines</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">""</span>), <span class="ident">lines</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">"baz"</span>), <span class="ident">lines</span>.<span class="ident">next</span>());
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">lines</span>.<span class="ident">next</span>());</pre>
|
||
|
||
<p>The final line ending isn't required:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">text</span> <span class="op">=</span> <span class="string">"foo\nbar\n\r\nbaz"</span>;
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lines</span> <span class="op">=</span> <span class="ident">text</span>.<span class="ident">lines</span>();
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">"foo"</span>), <span class="ident">lines</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">"bar"</span>), <span class="ident">lines</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">""</span>), <span class="ident">lines</span>.<span class="ident">next</span>());
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">"baz"</span>), <span class="ident">lines</span>.<span class="ident">next</span>());
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">lines</span>.<span class="ident">next</span>());</pre>
|
||
</div><h4 id='method.lines_any' class="method"><span id='lines_any.v' class='invisible'><code>fn <a href='#method.lines_any' class='fnname'>lines_any</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/nightly/core/str/struct.LinesAny.html" title="struct core::str::LinesAny">LinesAny</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
||
<div class='stability'><div class='stab deprecated'>Deprecated since 1.4.0<p>: use lines() instead now</p>
|
||
</div></div><div class='docblock'><p>An iterator over the lines of a string.</p>
|
||
</div><h4 id='method.encode_utf16' class="method"><span id='encode_utf16.v' class='invisible'><code>fn <a href='#method.encode_utf16' class='fnname'>encode_utf16</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/str/struct.EncodeUtf16.html" title="struct alloc::str::EncodeUtf16">EncodeUtf16</a></code><div class='since' title='Stable since Rust version 1.8.0'>1.8.0</div></span></h4>
|
||
<div class='docblock'><p>Returns an iterator of <code>u16</code> over the string encoded as UTF-16.</p>
|
||
</div><h4 id='method.contains' class="method"><span id='contains.v' class='invisible'><code>fn <a href='#method.contains' class='fnname'>contains</a><'a, P>(&'a self, pat: P) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a> <span class="where fmt-newline">where<br> P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>, </span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
||
<div class='docblock'><p>Returns <code>true</code> if the given pattern matches a sub-slice of
|
||
this string slice.</p>
|
||
|
||
<p>Returns <code>false</code> if it does not.</p>
|
||
|
||
<h1 id='examples-14' class='section-header'><a href='#examples-14'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">bananas</span> <span class="op">=</span> <span class="string">"bananas"</span>;
|
||
|
||
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">bananas</span>.<span class="ident">contains</span>(<span class="string">"nana"</span>));
|
||
<span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">bananas</span>.<span class="ident">contains</span>(<span class="string">"apples"</span>));</pre>
|
||
</div><h4 id='method.starts_with' class="method"><span id='starts_with.v' class='invisible'><code>fn <a href='#method.starts_with' class='fnname'>starts_with</a><'a, P>(&'a self, pat: P) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a> <span class="where fmt-newline">where<br> P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>, </span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
||
<div class='docblock'><p>Returns <code>true</code> if the given pattern matches a prefix of this
|
||
string slice.</p>
|
||
|
||
<p>Returns <code>false</code> if it does not.</p>
|
||
|
||
<h1 id='examples-15' class='section-header'><a href='#examples-15'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">bananas</span> <span class="op">=</span> <span class="string">"bananas"</span>;
|
||
|
||
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">bananas</span>.<span class="ident">starts_with</span>(<span class="string">"bana"</span>));
|
||
<span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">bananas</span>.<span class="ident">starts_with</span>(<span class="string">"nana"</span>));</pre>
|
||
</div><h4 id='method.ends_with' class="method"><span id='ends_with.v' class='invisible'><code>fn <a href='#method.ends_with' class='fnname'>ends_with</a><'a, P>(&'a self, pat: P) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a> <span class="where fmt-newline">where<br> P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>,<br> <P as <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.ReverseSearcher.html" title="trait core::str::pattern::ReverseSearcher">ReverseSearcher</a><'a>, </span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
||
<div class='docblock'><p>Returns <code>true</code> if the given pattern matches a suffix of this
|
||
string slice.</p>
|
||
|
||
<p>Returns <code>false</code> if it does not.</p>
|
||
|
||
<h1 id='examples-16' class='section-header'><a href='#examples-16'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">bananas</span> <span class="op">=</span> <span class="string">"bananas"</span>;
|
||
|
||
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">bananas</span>.<span class="ident">ends_with</span>(<span class="string">"anas"</span>));
|
||
<span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">bananas</span>.<span class="ident">ends_with</span>(<span class="string">"nana"</span>));</pre>
|
||
</div><h4 id='method.find' class="method"><span id='find.v' class='invisible'><code>fn <a href='#method.find' class='fnname'>find</a><'a, P>(&'a self, pat: P) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>> <span class="where fmt-newline">where<br> P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>, </span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
||
<div class='docblock'><p>Returns the byte index of the first character of this string slice that
|
||
matches the pattern.</p>
|
||
|
||
<p>Returns <a href="option/enum.Option.html#variant.None"><code>None</code></a> if the pattern doesn't match.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that determines if
|
||
a character matches.</p>
|
||
|
||
<h1 id='examples-17' class='section-header'><a href='#examples-17'>Examples</a></h1>
|
||
<p>Simple patterns:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">"Löwe 老虎 Léopard"</span>;
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">find</span>(<span class="string">'L'</span>), <span class="prelude-val">Some</span>(<span class="number">0</span>));
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">find</span>(<span class="string">'é'</span>), <span class="prelude-val">Some</span>(<span class="number">14</span>));
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">find</span>(<span class="string">"Léopard"</span>), <span class="prelude-val">Some</span>(<span class="number">13</span>));</pre>
|
||
|
||
<p>More complex patterns with closures:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">"Löwe 老虎 Léopard"</span>;
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">find</span>(<span class="ident">char</span>::<span class="ident">is_whitespace</span>), <span class="prelude-val">Some</span>(<span class="number">5</span>));
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">find</span>(<span class="ident">char</span>::<span class="ident">is_lowercase</span>), <span class="prelude-val">Some</span>(<span class="number">1</span>));</pre>
|
||
|
||
<p>Not finding the pattern:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">"Löwe 老虎 Léopard"</span>;
|
||
<span class="kw">let</span> <span class="ident">x</span>: <span class="kw-2">&</span>[_] <span class="op">=</span> <span class="kw-2">&</span>[<span class="string">'1'</span>, <span class="string">'2'</span>];
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">find</span>(<span class="ident">x</span>), <span class="prelude-val">None</span>);</pre>
|
||
</div><h4 id='method.rfind' class="method"><span id='rfind.v' class='invisible'><code>fn <a href='#method.rfind' class='fnname'>rfind</a><'a, P>(&'a self, pat: P) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>> <span class="where fmt-newline">where<br> P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>,<br> <P as <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.ReverseSearcher.html" title="trait core::str::pattern::ReverseSearcher">ReverseSearcher</a><'a>, </span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
||
<div class='docblock'><p>Returns the byte index of the last character of this string slice that
|
||
matches the pattern.</p>
|
||
|
||
<p>Returns <a href="option/enum.Option.html#variant.None"><code>None</code></a> if the pattern doesn't match.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that determines if
|
||
a character matches.</p>
|
||
|
||
<h1 id='examples-18' class='section-header'><a href='#examples-18'>Examples</a></h1>
|
||
<p>Simple patterns:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">"Löwe 老虎 Léopard"</span>;
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">rfind</span>(<span class="string">'L'</span>), <span class="prelude-val">Some</span>(<span class="number">13</span>));
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">rfind</span>(<span class="string">'é'</span>), <span class="prelude-val">Some</span>(<span class="number">14</span>));</pre>
|
||
|
||
<p>More complex patterns with closures:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">"Löwe 老虎 Léopard"</span>;
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">rfind</span>(<span class="ident">char</span>::<span class="ident">is_whitespace</span>), <span class="prelude-val">Some</span>(<span class="number">12</span>));
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">rfind</span>(<span class="ident">char</span>::<span class="ident">is_lowercase</span>), <span class="prelude-val">Some</span>(<span class="number">20</span>));</pre>
|
||
|
||
<p>Not finding the pattern:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">"Löwe 老虎 Léopard"</span>;
|
||
<span class="kw">let</span> <span class="ident">x</span>: <span class="kw-2">&</span>[_] <span class="op">=</span> <span class="kw-2">&</span>[<span class="string">'1'</span>, <span class="string">'2'</span>];
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">rfind</span>(<span class="ident">x</span>), <span class="prelude-val">None</span>);</pre>
|
||
</div><h4 id='method.split' class="method"><span id='split.v' class='invisible'><code>fn <a href='#method.split' class='fnname'>split</a><'a, P>(&'a self, pat: P) -> <a class="struct" href="https://doc.rust-lang.org/nightly/core/str/struct.Split.html" title="struct core::str::Split">Split</a><'a, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>, </span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
||
<div class='docblock'><p>An iterator over substrings of this string slice, separated by
|
||
characters matched by a pattern.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that determines the
|
||
split.</p>
|
||
|
||
<h1 id='iterator-behavior' class='section-header'><a href='#iterator-behavior'>Iterator behavior</a></h1>
|
||
<p>The returned iterator will be a <a href="iter/trait.DoubleEndedIterator.html"><code>DoubleEndedIterator</code></a> if the pattern
|
||
allows a reverse search and forward/reverse search yields the same
|
||
elements. This is true for, eg, <a href="primitive.char.html"><code>char</code></a> but not for <code>&str</code>.</p>
|
||
|
||
<p>If the pattern allows a reverse search but its results might differ
|
||
from a forward search, the <a href="#method.rsplit"><code>rsplit</code></a> method can be used.</p>
|
||
|
||
<h1 id='examples-19' class='section-header'><a href='#examples-19'>Examples</a></h1>
|
||
<p>Simple patterns:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"Mary had a little lamb"</span>.<span class="ident">split</span>(<span class="string">' '</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"Mary"</span>, <span class="string">"had"</span>, <span class="string">"a"</span>, <span class="string">"little"</span>, <span class="string">"lamb"</span>]);
|
||
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">""</span>.<span class="ident">split</span>(<span class="string">'X'</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">""</span>]);
|
||
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"lionXXtigerXleopard"</span>.<span class="ident">split</span>(<span class="string">'X'</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"lion"</span>, <span class="string">""</span>, <span class="string">"tiger"</span>, <span class="string">"leopard"</span>]);
|
||
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"lion::tiger::leopard"</span>.<span class="ident">split</span>(<span class="string">"::"</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"lion"</span>, <span class="string">"tiger"</span>, <span class="string">"leopard"</span>]);
|
||
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"abc1def2ghi"</span>.<span class="ident">split</span>(<span class="ident">char</span>::<span class="ident">is_numeric</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"abc"</span>, <span class="string">"def"</span>, <span class="string">"ghi"</span>]);
|
||
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"lionXtigerXleopard"</span>.<span class="ident">split</span>(<span class="ident">char</span>::<span class="ident">is_uppercase</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"lion"</span>, <span class="string">"tiger"</span>, <span class="string">"leopard"</span>]);</pre>
|
||
|
||
<p>A more complex pattern, using a closure:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"abc1defXghi"</span>.<span class="ident">split</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">'1'</span> <span class="op">||</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">'X'</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"abc"</span>, <span class="string">"def"</span>, <span class="string">"ghi"</span>]);</pre>
|
||
|
||
<p>If a string contains multiple contiguous separators, you will end up
|
||
with empty strings in the output:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> <span class="string">"||||a||b|c"</span>.<span class="ident">to_string</span>();
|
||
<span class="kw">let</span> <span class="ident">d</span>: <span class="ident">Vec</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="ident">x</span>.<span class="ident">split</span>(<span class="string">'|'</span>).<span class="ident">collect</span>();
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>, <span class="kw-2">&</span>[<span class="string">""</span>, <span class="string">""</span>, <span class="string">""</span>, <span class="string">""</span>, <span class="string">"a"</span>, <span class="string">""</span>, <span class="string">"b"</span>, <span class="string">"c"</span>]);</pre>
|
||
|
||
<p>Contiguous separators are separated by the empty string.</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> <span class="string">"(///)"</span>.<span class="ident">to_string</span>();
|
||
<span class="kw">let</span> <span class="ident">d</span>: <span class="ident">Vec</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="ident">x</span>.<span class="ident">split</span>(<span class="string">'/'</span>).<span class="ident">collect</span>();
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>, <span class="kw-2">&</span>[<span class="string">"("</span>, <span class="string">""</span>, <span class="string">""</span>, <span class="string">")"</span>]);</pre>
|
||
|
||
<p>Separators at the start or end of a string are neighbored
|
||
by empty strings.</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">d</span>: <span class="ident">Vec</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="string">"010"</span>.<span class="ident">split</span>(<span class="string">"0"</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>, <span class="kw-2">&</span>[<span class="string">""</span>, <span class="string">"1"</span>, <span class="string">""</span>]);</pre>
|
||
|
||
<p>When the empty string is used as a separator, it separates
|
||
every character in the string, along with the beginning
|
||
and end of the string.</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">f</span>: <span class="ident">Vec</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="string">"rust"</span>.<span class="ident">split</span>(<span class="string">""</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="kw-2">&</span>[<span class="string">""</span>, <span class="string">"r"</span>, <span class="string">"u"</span>, <span class="string">"s"</span>, <span class="string">"t"</span>, <span class="string">""</span>]);</pre>
|
||
|
||
<p>Contiguous separators can lead to possibly surprising behavior
|
||
when whitespace is used as the separator. This code is correct:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> <span class="string">" a b c"</span>.<span class="ident">to_string</span>();
|
||
<span class="kw">let</span> <span class="ident">d</span>: <span class="ident">Vec</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="ident">x</span>.<span class="ident">split</span>(<span class="string">' '</span>).<span class="ident">collect</span>();
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>, <span class="kw-2">&</span>[<span class="string">""</span>, <span class="string">""</span>, <span class="string">""</span>, <span class="string">""</span>, <span class="string">"a"</span>, <span class="string">""</span>, <span class="string">"b"</span>, <span class="string">"c"</span>]);</pre>
|
||
|
||
<p>It does <em>not</em> give you:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>, <span class="kw-2">&</span>[<span class="string">"a"</span>, <span class="string">"b"</span>, <span class="string">"c"</span>]);</pre>
|
||
|
||
<p>Use <a href="#method.split_whitespace"><code>split_whitespace</code></a> for this behavior.</p>
|
||
</div><h4 id='method.rsplit' class="method"><span id='rsplit.v' class='invisible'><code>fn <a href='#method.rsplit' class='fnname'>rsplit</a><'a, P>(&'a self, pat: P) -> <a class="struct" href="https://doc.rust-lang.org/nightly/core/str/struct.RSplit.html" title="struct core::str::RSplit">RSplit</a><'a, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>,<br> <P as <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.ReverseSearcher.html" title="trait core::str::pattern::ReverseSearcher">ReverseSearcher</a><'a>, </span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
||
<div class='docblock'><p>An iterator over substrings of the given string slice, separated by
|
||
characters matched by a pattern and yielded in reverse order.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that determines the
|
||
split.</p>
|
||
|
||
<h1 id='iterator-behavior-1' class='section-header'><a href='#iterator-behavior-1'>Iterator behavior</a></h1>
|
||
<p>The returned iterator requires that the pattern supports a reverse
|
||
search, and it will be a <a href="iter/trait.DoubleEndedIterator.html"><code>DoubleEndedIterator</code></a> if a forward/reverse
|
||
search yields the same elements.</p>
|
||
|
||
<p>For iterating from the front, the <a href="#method.split"><code>split</code></a> method can be used.</p>
|
||
|
||
<h1 id='examples-20' class='section-header'><a href='#examples-20'>Examples</a></h1>
|
||
<p>Simple patterns:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"Mary had a little lamb"</span>.<span class="ident">rsplit</span>(<span class="string">' '</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"lamb"</span>, <span class="string">"little"</span>, <span class="string">"a"</span>, <span class="string">"had"</span>, <span class="string">"Mary"</span>]);
|
||
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">""</span>.<span class="ident">rsplit</span>(<span class="string">'X'</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">""</span>]);
|
||
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"lionXXtigerXleopard"</span>.<span class="ident">rsplit</span>(<span class="string">'X'</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"leopard"</span>, <span class="string">"tiger"</span>, <span class="string">""</span>, <span class="string">"lion"</span>]);
|
||
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"lion::tiger::leopard"</span>.<span class="ident">rsplit</span>(<span class="string">"::"</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"leopard"</span>, <span class="string">"tiger"</span>, <span class="string">"lion"</span>]);</pre>
|
||
|
||
<p>A more complex pattern, using a closure:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"abc1defXghi"</span>.<span class="ident">rsplit</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">'1'</span> <span class="op">||</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">'X'</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"ghi"</span>, <span class="string">"def"</span>, <span class="string">"abc"</span>]);</pre>
|
||
</div><h4 id='method.split_terminator' class="method"><span id='split_terminator.v' class='invisible'><code>fn <a href='#method.split_terminator' class='fnname'>split_terminator</a><'a, P>(&'a self, pat: P) -> <a class="struct" href="https://doc.rust-lang.org/nightly/core/str/struct.SplitTerminator.html" title="struct core::str::SplitTerminator">SplitTerminator</a><'a, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>, </span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
||
<div class='docblock'><p>An iterator over substrings of the given string slice, separated by
|
||
characters matched by a pattern.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that determines the
|
||
split.</p>
|
||
|
||
<p>Equivalent to <a href="#method.split"><code>split</code></a>, except that the trailing substring
|
||
is skipped if empty.</p>
|
||
|
||
<p>This method can be used for string data that is <em>terminated</em>,
|
||
rather than <em>separated</em> by a pattern.</p>
|
||
|
||
<h1 id='iterator-behavior-2' class='section-header'><a href='#iterator-behavior-2'>Iterator behavior</a></h1>
|
||
<p>The returned iterator will be a <a href="iter/trait.DoubleEndedIterator.html"><code>DoubleEndedIterator</code></a> if the pattern
|
||
allows a reverse search and forward/reverse search yields the same
|
||
elements. This is true for, eg, <a href="primitive.char.html"><code>char</code></a> but not for <code>&str</code>.</p>
|
||
|
||
<p>If the pattern allows a reverse search but its results might differ
|
||
from a forward search, the <a href="#method.rsplit_terminator"><code>rsplit_terminator</code></a> method can be used.</p>
|
||
|
||
<h1 id='examples-21' class='section-header'><a href='#examples-21'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"A.B."</span>.<span class="ident">split_terminator</span>(<span class="string">'.'</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"A"</span>, <span class="string">"B"</span>]);
|
||
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"A..B.."</span>.<span class="ident">split_terminator</span>(<span class="string">"."</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"A"</span>, <span class="string">""</span>, <span class="string">"B"</span>, <span class="string">""</span>]);</pre>
|
||
</div><h4 id='method.rsplit_terminator' class="method"><span id='rsplit_terminator.v' class='invisible'><code>fn <a href='#method.rsplit_terminator' class='fnname'>rsplit_terminator</a><'a, P>(&'a self, pat: P) -> <a class="struct" href="https://doc.rust-lang.org/nightly/core/str/struct.RSplitTerminator.html" title="struct core::str::RSplitTerminator">RSplitTerminator</a><'a, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>,<br> <P as <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.ReverseSearcher.html" title="trait core::str::pattern::ReverseSearcher">ReverseSearcher</a><'a>, </span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
||
<div class='docblock'><p>An iterator over substrings of <code>self</code>, separated by characters
|
||
matched by a pattern and yielded in reverse order.</p>
|
||
|
||
<p>The pattern can be a simple <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that
|
||
determines the split.
|
||
Additional libraries might provide more complex patterns like
|
||
regular expressions.</p>
|
||
|
||
<p>Equivalent to <a href="#method.split"><code>split</code></a>, except that the trailing substring is
|
||
skipped if empty.</p>
|
||
|
||
<p>This method can be used for string data that is <em>terminated</em>,
|
||
rather than <em>separated</em> by a pattern.</p>
|
||
|
||
<h1 id='iterator-behavior-3' class='section-header'><a href='#iterator-behavior-3'>Iterator behavior</a></h1>
|
||
<p>The returned iterator requires that the pattern supports a
|
||
reverse search, and it will be double ended if a forward/reverse
|
||
search yields the same elements.</p>
|
||
|
||
<p>For iterating from the front, the <a href="#method.split_terminator"><code>split_terminator</code></a> method can be
|
||
used.</p>
|
||
|
||
<h1 id='examples-22' class='section-header'><a href='#examples-22'>Examples</a></h1>
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"A.B."</span>.<span class="ident">rsplit_terminator</span>(<span class="string">'.'</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"B"</span>, <span class="string">"A"</span>]);
|
||
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"A..B.."</span>.<span class="ident">rsplit_terminator</span>(<span class="string">"."</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">""</span>, <span class="string">"B"</span>, <span class="string">""</span>, <span class="string">"A"</span>]);</pre>
|
||
</div><h4 id='method.splitn' class="method"><span id='splitn.v' class='invisible'><code>fn <a href='#method.splitn' class='fnname'>splitn</a><'a, P>(&'a self, n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, pat: P) -> <a class="struct" href="https://doc.rust-lang.org/nightly/core/str/struct.SplitN.html" title="struct core::str::SplitN">SplitN</a><'a, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>, </span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
||
<div class='docblock'><p>An iterator over substrings of the given string slice, separated by a
|
||
pattern, restricted to returning at most <code>n</code> items.</p>
|
||
|
||
<p>If <code>n</code> substrings are returned, the last substring (the <code>n</code>th substring)
|
||
will contain the remainder of the string.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that determines the
|
||
split.</p>
|
||
|
||
<h1 id='iterator-behavior-4' class='section-header'><a href='#iterator-behavior-4'>Iterator behavior</a></h1>
|
||
<p>The returned iterator will not be double ended, because it is
|
||
not efficient to support.</p>
|
||
|
||
<p>If the pattern allows a reverse search, the <a href="#method.rsplitn"><code>rsplitn</code></a> method can be
|
||
used.</p>
|
||
|
||
<h1 id='examples-23' class='section-header'><a href='#examples-23'>Examples</a></h1>
|
||
<p>Simple patterns:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"Mary had a little lambda"</span>.<span class="ident">splitn</span>(<span class="number">3</span>, <span class="string">' '</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"Mary"</span>, <span class="string">"had"</span>, <span class="string">"a little lambda"</span>]);
|
||
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"lionXXtigerXleopard"</span>.<span class="ident">splitn</span>(<span class="number">3</span>, <span class="string">"X"</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"lion"</span>, <span class="string">""</span>, <span class="string">"tigerXleopard"</span>]);
|
||
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"abcXdef"</span>.<span class="ident">splitn</span>(<span class="number">1</span>, <span class="string">'X'</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"abcXdef"</span>]);
|
||
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">""</span>.<span class="ident">splitn</span>(<span class="number">1</span>, <span class="string">'X'</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">""</span>]);</pre>
|
||
|
||
<p>A more complex pattern, using a closure:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"abc1defXghi"</span>.<span class="ident">splitn</span>(<span class="number">2</span>, <span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">'1'</span> <span class="op">||</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">'X'</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"abc"</span>, <span class="string">"defXghi"</span>]);</pre>
|
||
</div><h4 id='method.rsplitn' class="method"><span id='rsplitn.v' class='invisible'><code>fn <a href='#method.rsplitn' class='fnname'>rsplitn</a><'a, P>(&'a self, n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, pat: P) -> <a class="struct" href="https://doc.rust-lang.org/nightly/core/str/struct.RSplitN.html" title="struct core::str::RSplitN">RSplitN</a><'a, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>,<br> <P as <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.ReverseSearcher.html" title="trait core::str::pattern::ReverseSearcher">ReverseSearcher</a><'a>, </span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
||
<div class='docblock'><p>An iterator over substrings of this string slice, separated by a
|
||
pattern, starting from the end of the string, restricted to returning
|
||
at most <code>n</code> items.</p>
|
||
|
||
<p>If <code>n</code> substrings are returned, the last substring (the <code>n</code>th substring)
|
||
will contain the remainder of the string.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that
|
||
determines the split.</p>
|
||
|
||
<h1 id='iterator-behavior-5' class='section-header'><a href='#iterator-behavior-5'>Iterator behavior</a></h1>
|
||
<p>The returned iterator will not be double ended, because it is not
|
||
efficient to support.</p>
|
||
|
||
<p>For splitting from the front, the <a href="#method.splitn"><code>splitn</code></a> method can be used.</p>
|
||
|
||
<h1 id='examples-24' class='section-header'><a href='#examples-24'>Examples</a></h1>
|
||
<p>Simple patterns:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"Mary had a little lamb"</span>.<span class="ident">rsplitn</span>(<span class="number">3</span>, <span class="string">' '</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"lamb"</span>, <span class="string">"little"</span>, <span class="string">"Mary had a"</span>]);
|
||
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"lionXXtigerXleopard"</span>.<span class="ident">rsplitn</span>(<span class="number">3</span>, <span class="string">'X'</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"leopard"</span>, <span class="string">"tiger"</span>, <span class="string">"lionX"</span>]);
|
||
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"lion::tiger::leopard"</span>.<span class="ident">rsplitn</span>(<span class="number">2</span>, <span class="string">"::"</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"leopard"</span>, <span class="string">"lion::tiger"</span>]);</pre>
|
||
|
||
<p>A more complex pattern, using a closure:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"abc1defXghi"</span>.<span class="ident">rsplitn</span>(<span class="number">2</span>, <span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">'1'</span> <span class="op">||</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">'X'</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"ghi"</span>, <span class="string">"abc1def"</span>]);</pre>
|
||
</div><h4 id='method.matches' class="method"><span id='matches.v' class='invisible'><code>fn <a href='#method.matches' class='fnname'>matches</a><'a, P>(&'a self, pat: P) -> <a class="struct" href="https://doc.rust-lang.org/nightly/core/str/struct.Matches.html" title="struct core::str::Matches">Matches</a><'a, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>, </span></code><div class='since' title='Stable since Rust version 1.2.0'>1.2.0</div></span></h4>
|
||
<div class='docblock'><p>An iterator over the disjoint matches of a pattern within the given string
|
||
slice.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that
|
||
determines if a character matches.</p>
|
||
|
||
<h1 id='iterator-behavior-6' class='section-header'><a href='#iterator-behavior-6'>Iterator behavior</a></h1>
|
||
<p>The returned iterator will be a <a href="iter/trait.DoubleEndedIterator.html"><code>DoubleEndedIterator</code></a> if the pattern
|
||
allows a reverse search and forward/reverse search yields the same
|
||
elements. This is true for, eg, <a href="primitive.char.html"><code>char</code></a> but not for <code>&str</code>.</p>
|
||
|
||
<p>If the pattern allows a reverse search but its results might differ
|
||
from a forward search, the <a href="#method.rmatches"><code>rmatches</code></a> method can be used.</p>
|
||
|
||
<h1 id='examples-25' class='section-header'><a href='#examples-25'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"abcXXXabcYYYabc"</span>.<span class="ident">matches</span>(<span class="string">"abc"</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"abc"</span>, <span class="string">"abc"</span>, <span class="string">"abc"</span>]);
|
||
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"1abc2abc3"</span>.<span class="ident">matches</span>(<span class="ident">char</span>::<span class="ident">is_numeric</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"1"</span>, <span class="string">"2"</span>, <span class="string">"3"</span>]);</pre>
|
||
</div><h4 id='method.rmatches' class="method"><span id='rmatches.v' class='invisible'><code>fn <a href='#method.rmatches' class='fnname'>rmatches</a><'a, P>(&'a self, pat: P) -> <a class="struct" href="https://doc.rust-lang.org/nightly/core/str/struct.RMatches.html" title="struct core::str::RMatches">RMatches</a><'a, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>,<br> <P as <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.ReverseSearcher.html" title="trait core::str::pattern::ReverseSearcher">ReverseSearcher</a><'a>, </span></code><div class='since' title='Stable since Rust version 1.2.0'>1.2.0</div></span></h4>
|
||
<div class='docblock'><p>An iterator over the disjoint matches of a pattern within this string slice,
|
||
yielded in reverse order.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that determines if
|
||
a character matches.</p>
|
||
|
||
<h1 id='iterator-behavior-7' class='section-header'><a href='#iterator-behavior-7'>Iterator behavior</a></h1>
|
||
<p>The returned iterator requires that the pattern supports a reverse
|
||
search, and it will be a <a href="iter/trait.DoubleEndedIterator.html"><code>DoubleEndedIterator</code></a> if a forward/reverse
|
||
search yields the same elements.</p>
|
||
|
||
<p>For iterating from the front, the <a href="#method.matches"><code>matches</code></a> method can be used.</p>
|
||
|
||
<h1 id='examples-26' class='section-header'><a href='#examples-26'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"abcXXXabcYYYabc"</span>.<span class="ident">rmatches</span>(<span class="string">"abc"</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"abc"</span>, <span class="string">"abc"</span>, <span class="string">"abc"</span>]);
|
||
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> <span class="string">"1abc2abc3"</span>.<span class="ident">rmatches</span>(<span class="ident">char</span>::<span class="ident">is_numeric</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="string">"3"</span>, <span class="string">"2"</span>, <span class="string">"1"</span>]);</pre>
|
||
</div><h4 id='method.match_indices' class="method"><span id='match_indices.v' class='invisible'><code>fn <a href='#method.match_indices' class='fnname'>match_indices</a><'a, P>(&'a self, pat: P) -> <a class="struct" href="https://doc.rust-lang.org/nightly/core/str/struct.MatchIndices.html" title="struct core::str::MatchIndices">MatchIndices</a><'a, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>, </span></code><div class='since' title='Stable since Rust version 1.5.0'>1.5.0</div></span></h4>
|
||
<div class='docblock'><p>An iterator over the disjoint matches of a pattern within this string
|
||
slice as well as the index that the match starts at.</p>
|
||
|
||
<p>For matches of <code>pat</code> within <code>self</code> that overlap, only the indices
|
||
corresponding to the first match are returned.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that determines
|
||
if a character matches.</p>
|
||
|
||
<h1 id='iterator-behavior-8' class='section-header'><a href='#iterator-behavior-8'>Iterator behavior</a></h1>
|
||
<p>The returned iterator will be a <a href="iter/trait.DoubleEndedIterator.html"><code>DoubleEndedIterator</code></a> if the pattern
|
||
allows a reverse search and forward/reverse search yields the same
|
||
elements. This is true for, eg, <a href="primitive.char.html"><code>char</code></a> but not for <code>&str</code>.</p>
|
||
|
||
<p>If the pattern allows a reverse search but its results might differ
|
||
from a forward search, the <a href="#method.rmatch_indices"><code>rmatch_indices</code></a> method can be used.</p>
|
||
|
||
<h1 id='examples-27' class='section-header'><a href='#examples-27'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="string">"abcXXXabcYYYabc"</span>.<span class="ident">match_indices</span>(<span class="string">"abc"</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [(<span class="number">0</span>, <span class="string">"abc"</span>), (<span class="number">6</span>, <span class="string">"abc"</span>), (<span class="number">12</span>, <span class="string">"abc"</span>)]);
|
||
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="string">"1abcabc2"</span>.<span class="ident">match_indices</span>(<span class="string">"abc"</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [(<span class="number">1</span>, <span class="string">"abc"</span>), (<span class="number">4</span>, <span class="string">"abc"</span>)]);
|
||
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="string">"ababa"</span>.<span class="ident">match_indices</span>(<span class="string">"aba"</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [(<span class="number">0</span>, <span class="string">"aba"</span>)]); <span class="comment">// only the first `aba`</span></pre>
|
||
</div><h4 id='method.rmatch_indices' class="method"><span id='rmatch_indices.v' class='invisible'><code>fn <a href='#method.rmatch_indices' class='fnname'>rmatch_indices</a><'a, P>(&'a self, pat: P) -> <a class="struct" href="https://doc.rust-lang.org/nightly/core/str/struct.RMatchIndices.html" title="struct core::str::RMatchIndices">RMatchIndices</a><'a, P> <span class="where fmt-newline">where<br> P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>,<br> <P as <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.ReverseSearcher.html" title="trait core::str::pattern::ReverseSearcher">ReverseSearcher</a><'a>, </span></code><div class='since' title='Stable since Rust version 1.5.0'>1.5.0</div></span></h4>
|
||
<div class='docblock'><p>An iterator over the disjoint matches of a pattern within <code>self</code>,
|
||
yielded in reverse order along with the index of the match.</p>
|
||
|
||
<p>For matches of <code>pat</code> within <code>self</code> that overlap, only the indices
|
||
corresponding to the last match are returned.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that determines if a
|
||
character matches.</p>
|
||
|
||
<h1 id='iterator-behavior-9' class='section-header'><a href='#iterator-behavior-9'>Iterator behavior</a></h1>
|
||
<p>The returned iterator requires that the pattern supports a reverse
|
||
search, and it will be a <a href="iter/trait.DoubleEndedIterator.html"><code>DoubleEndedIterator</code></a> if a forward/reverse
|
||
search yields the same elements.</p>
|
||
|
||
<p>For iterating from the front, the <a href="#method.match_indices"><code>match_indices</code></a> method can be used.</p>
|
||
|
||
<h1 id='examples-28' class='section-header'><a href='#examples-28'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="string">"abcXXXabcYYYabc"</span>.<span class="ident">rmatch_indices</span>(<span class="string">"abc"</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [(<span class="number">12</span>, <span class="string">"abc"</span>), (<span class="number">6</span>, <span class="string">"abc"</span>), (<span class="number">0</span>, <span class="string">"abc"</span>)]);
|
||
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="string">"1abcabc2"</span>.<span class="ident">rmatch_indices</span>(<span class="string">"abc"</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [(<span class="number">4</span>, <span class="string">"abc"</span>), (<span class="number">1</span>, <span class="string">"abc"</span>)]);
|
||
|
||
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="string">"ababa"</span>.<span class="ident">rmatch_indices</span>(<span class="string">"aba"</span>).<span class="ident">collect</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [(<span class="number">2</span>, <span class="string">"aba"</span>)]); <span class="comment">// only the last `aba`</span></pre>
|
||
</div><h4 id='method.trim' class="method"><span id='trim.v' class='invisible'><code>fn <a href='#method.trim' class='fnname'>trim</a>(&self) -> &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
||
<div class='docblock'><p>Returns a string slice with leading and trailing whitespace removed.</p>
|
||
|
||
<p>'Whitespace' is defined according to the terms of the Unicode Derived
|
||
Core Property <code>White_Space</code>.</p>
|
||
|
||
<h1 id='examples-29' class='section-header'><a href='#examples-29'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">" Hello\tworld\t"</span>;
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"Hello\tworld"</span>, <span class="ident">s</span>.<span class="ident">trim</span>());</pre>
|
||
</div><h4 id='method.trim_left' class="method"><span id='trim_left.v' class='invisible'><code>fn <a href='#method.trim_left' class='fnname'>trim_left</a>(&self) -> &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
||
<div class='docblock'><p>Returns a string slice with leading whitespace removed.</p>
|
||
|
||
<p>'Whitespace' is defined according to the terms of the Unicode Derived
|
||
Core Property <code>White_Space</code>.</p>
|
||
|
||
<h1 id='text-directionality' class='section-header'><a href='#text-directionality'>Text directionality</a></h1>
|
||
<p>A string is a sequence of bytes. 'Left' in this context means the first
|
||
position of that byte string; for a language like Arabic or Hebrew
|
||
which are 'right to left' rather than 'left to right', this will be
|
||
the <em>right</em> side, not the left.</p>
|
||
|
||
<h1 id='examples-30' class='section-header'><a href='#examples-30'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">" Hello\tworld\t"</span>;
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"Hello\tworld\t"</span>, <span class="ident">s</span>.<span class="ident">trim_left</span>());</pre>
|
||
|
||
<p>Directionality:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">" English"</span>;
|
||
<span class="macro">assert</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">'E'</span>) <span class="op">==</span> <span class="ident">s</span>.<span class="ident">trim_left</span>().<span class="ident">chars</span>().<span class="ident">next</span>());
|
||
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">" עברית"</span>;
|
||
<span class="macro">assert</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">'ע'</span>) <span class="op">==</span> <span class="ident">s</span>.<span class="ident">trim_left</span>().<span class="ident">chars</span>().<span class="ident">next</span>());</pre>
|
||
</div><h4 id='method.trim_right' class="method"><span id='trim_right.v' class='invisible'><code>fn <a href='#method.trim_right' class='fnname'>trim_right</a>(&self) -> &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
||
<div class='docblock'><p>Returns a string slice with trailing whitespace removed.</p>
|
||
|
||
<p>'Whitespace' is defined according to the terms of the Unicode Derived
|
||
Core Property <code>White_Space</code>.</p>
|
||
|
||
<h1 id='text-directionality-1' class='section-header'><a href='#text-directionality-1'>Text directionality</a></h1>
|
||
<p>A string is a sequence of bytes. 'Right' in this context means the last
|
||
position of that byte string; for a language like Arabic or Hebrew
|
||
which are 'right to left' rather than 'left to right', this will be
|
||
the <em>left</em> side, not the right.</p>
|
||
|
||
<h1 id='examples-31' class='section-header'><a href='#examples-31'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">" Hello\tworld\t"</span>;
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">" Hello\tworld"</span>, <span class="ident">s</span>.<span class="ident">trim_right</span>());</pre>
|
||
|
||
<p>Directionality:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">"English "</span>;
|
||
<span class="macro">assert</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">'h'</span>) <span class="op">==</span> <span class="ident">s</span>.<span class="ident">trim_right</span>().<span class="ident">chars</span>().<span class="ident">rev</span>().<span class="ident">next</span>());
|
||
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">"עברית "</span>;
|
||
<span class="macro">assert</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="string">'ת'</span>) <span class="op">==</span> <span class="ident">s</span>.<span class="ident">trim_right</span>().<span class="ident">chars</span>().<span class="ident">rev</span>().<span class="ident">next</span>());</pre>
|
||
</div><h4 id='method.trim_matches' class="method"><span id='trim_matches.v' class='invisible'><code>fn <a href='#method.trim_matches' class='fnname'>trim_matches</a><'a, P>(&'a self, pat: P) -> &'a <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a> <span class="where fmt-newline">where<br> P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>,<br> <P as <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.DoubleEndedSearcher.html" title="trait core::str::pattern::DoubleEndedSearcher">DoubleEndedSearcher</a><'a>, </span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
||
<div class='docblock'><p>Returns a string slice with all prefixes and suffixes that match a
|
||
pattern repeatedly removed.</p>
|
||
|
||
<p>The pattern can be a <a href="primitive.char.html"><code>char</code></a> or a closure that determines if a
|
||
character matches.</p>
|
||
|
||
<h1 id='examples-32' class='section-header'><a href='#examples-32'>Examples</a></h1>
|
||
<p>Simple patterns:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"11foo1bar11"</span>.<span class="ident">trim_matches</span>(<span class="string">'1'</span>), <span class="string">"foo1bar"</span>);
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"123foo1bar123"</span>.<span class="ident">trim_matches</span>(<span class="ident">char</span>::<span class="ident">is_numeric</span>), <span class="string">"foo1bar"</span>);
|
||
|
||
<span class="kw">let</span> <span class="ident">x</span>: <span class="kw-2">&</span>[_] <span class="op">=</span> <span class="kw-2">&</span>[<span class="string">'1'</span>, <span class="string">'2'</span>];
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"12foo1bar12"</span>.<span class="ident">trim_matches</span>(<span class="ident">x</span>), <span class="string">"foo1bar"</span>);</pre>
|
||
|
||
<p>A more complex pattern, using a closure:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"1foo1barXX"</span>.<span class="ident">trim_matches</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">'1'</span> <span class="op">||</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">'X'</span>), <span class="string">"foo1bar"</span>);</pre>
|
||
</div><h4 id='method.trim_left_matches' class="method"><span id='trim_left_matches.v' class='invisible'><code>fn <a href='#method.trim_left_matches' class='fnname'>trim_left_matches</a><'a, P>(&'a self, pat: P) -> &'a <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a> <span class="where fmt-newline">where<br> P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>, </span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
||
<div class='docblock'><p>Returns a string slice with all prefixes that match a pattern
|
||
repeatedly removed.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that determines if
|
||
a character matches.</p>
|
||
|
||
<h1 id='text-directionality-2' class='section-header'><a href='#text-directionality-2'>Text directionality</a></h1>
|
||
<p>A string is a sequence of bytes. 'Left' in this context means the first
|
||
position of that byte string; for a language like Arabic or Hebrew
|
||
which are 'right to left' rather than 'left to right', this will be
|
||
the <em>right</em> side, not the left.</p>
|
||
|
||
<h1 id='examples-33' class='section-header'><a href='#examples-33'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"11foo1bar11"</span>.<span class="ident">trim_left_matches</span>(<span class="string">'1'</span>), <span class="string">"foo1bar11"</span>);
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"123foo1bar123"</span>.<span class="ident">trim_left_matches</span>(<span class="ident">char</span>::<span class="ident">is_numeric</span>), <span class="string">"foo1bar123"</span>);
|
||
|
||
<span class="kw">let</span> <span class="ident">x</span>: <span class="kw-2">&</span>[_] <span class="op">=</span> <span class="kw-2">&</span>[<span class="string">'1'</span>, <span class="string">'2'</span>];
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"12foo1bar12"</span>.<span class="ident">trim_left_matches</span>(<span class="ident">x</span>), <span class="string">"foo1bar12"</span>);</pre>
|
||
</div><h4 id='method.trim_right_matches' class="method"><span id='trim_right_matches.v' class='invisible'><code>fn <a href='#method.trim_right_matches' class='fnname'>trim_right_matches</a><'a, P>(&'a self, pat: P) -> &'a <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a> <span class="where fmt-newline">where<br> P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>,<br> <P as <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html#associatedtype.Searcher" title="type core::str::pattern::Pattern::Searcher">Searcher</a>: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.ReverseSearcher.html" title="trait core::str::pattern::ReverseSearcher">ReverseSearcher</a><'a>, </span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
||
<div class='docblock'><p>Returns a string slice with all suffixes that match a pattern
|
||
repeatedly removed.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that
|
||
determines if a character matches.</p>
|
||
|
||
<h1 id='text-directionality-3' class='section-header'><a href='#text-directionality-3'>Text directionality</a></h1>
|
||
<p>A string is a sequence of bytes. 'Right' in this context means the last
|
||
position of that byte string; for a language like Arabic or Hebrew
|
||
which are 'right to left' rather than 'left to right', this will be
|
||
the <em>left</em> side, not the right.</p>
|
||
|
||
<h1 id='examples-34' class='section-header'><a href='#examples-34'>Examples</a></h1>
|
||
<p>Simple patterns:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"11foo1bar11"</span>.<span class="ident">trim_right_matches</span>(<span class="string">'1'</span>), <span class="string">"11foo1bar"</span>);
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"123foo1bar123"</span>.<span class="ident">trim_right_matches</span>(<span class="ident">char</span>::<span class="ident">is_numeric</span>), <span class="string">"123foo1bar"</span>);
|
||
|
||
<span class="kw">let</span> <span class="ident">x</span>: <span class="kw-2">&</span>[_] <span class="op">=</span> <span class="kw-2">&</span>[<span class="string">'1'</span>, <span class="string">'2'</span>];
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"12foo1bar12"</span>.<span class="ident">trim_right_matches</span>(<span class="ident">x</span>), <span class="string">"12foo1bar"</span>);</pre>
|
||
|
||
<p>A more complex pattern, using a closure:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"1fooX"</span>.<span class="ident">trim_left_matches</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">'1'</span> <span class="op">||</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">'X'</span>), <span class="string">"fooX"</span>);</pre>
|
||
</div><h4 id='method.parse' class="method"><span id='parse.v' class='invisible'><code>fn <a href='#method.parse' class='fnname'>parse</a><F>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><F, <F as <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/trait.FromStr.html" title="trait core::str::FromStr">FromStr</a>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/str/trait.FromStr.html#associatedtype.Err" title="type core::str::FromStr::Err">Err</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/trait.FromStr.html" title="trait core::str::FromStr">FromStr</a>, </span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
||
<div class='docblock'><p>Parses this string slice into another type.</p>
|
||
|
||
<p>Because <code>parse</code> is so general, it can cause problems with type
|
||
inference. As such, <code>parse</code> is one of the few times you'll see
|
||
the syntax affectionately known as the 'turbofish': <code>::<></code>. This
|
||
helps the inference algorithm understand specifically which type
|
||
you're trying to parse into.</p>
|
||
|
||
<p><code>parse</code> can parse any type that implements the <a href="str/trait.FromStr.html"><code>FromStr</code></a> trait.</p>
|
||
|
||
<h1 id='errors' class='section-header'><a href='#errors'>Errors</a></h1>
|
||
<p>Will return <a href="str/trait.FromStr.html#associatedtype.Err"><code>Err</code></a> if it's not possible to parse this string slice into
|
||
the desired type.</p>
|
||
|
||
<h1 id='example' class='section-header'><a href='#example'>Example</a></h1>
|
||
<p>Basic usage</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">four</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="string">"4"</span>.<span class="ident">parse</span>().<span class="ident">unwrap</span>();
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">4</span>, <span class="ident">four</span>);</pre>
|
||
|
||
<p>Using the 'turbofish' instead of annotating <code>four</code>:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">four</span> <span class="op">=</span> <span class="string">"4"</span>.<span class="ident">parse</span>::<span class="op"><</span><span class="ident">u32</span><span class="op">></span>();
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Ok</span>(<span class="number">4</span>), <span class="ident">four</span>);</pre>
|
||
|
||
<p>Failing to parse:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">nope</span> <span class="op">=</span> <span class="string">"j"</span>.<span class="ident">parse</span>::<span class="op"><</span><span class="ident">u32</span><span class="op">></span>();
|
||
|
||
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">nope</span>.<span class="ident">is_err</span>());</pre>
|
||
</div><h4 id='method.replace' class="method"><span id='replace.v' class='invisible'><code>fn <a href='#method.replace' class='fnname'>replace</a><'a, P>(&'a self, from: P, to: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>) -> <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a> <span class="where fmt-newline">where<br> P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>, </span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
|
||
<div class='docblock'><p>Replaces all matches of a pattern with another string.</p>
|
||
|
||
<p><code>replace</code> creates a new <a href="string/struct.String.html"><code>String</code></a>, and copies the data from this string slice into it.
|
||
While doing so, it attempts to find matches of a pattern. If it finds any, it
|
||
replaces them with the replacement string slice.</p>
|
||
|
||
<h1 id='examples-35' class='section-header'><a href='#examples-35'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">"this is old"</span>;
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"this is new"</span>, <span class="ident">s</span>.<span class="ident">replace</span>(<span class="string">"old"</span>, <span class="string">"new"</span>));</pre>
|
||
|
||
<p>When the pattern doesn't match:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">"this is old"</span>;
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>, <span class="ident">s</span>.<span class="ident">replace</span>(<span class="string">"cookie monster"</span>, <span class="string">"little lamb"</span>));</pre>
|
||
</div><h4 id='method.replacen' class="method"><span id='replacen.v' class='invisible'><code>fn <a href='#method.replacen' class='fnname'>replacen</a><'a, P>(&'a self, pat: P, to: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, count: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a> <span class="where fmt-newline">where<br> P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html" title="trait core::str::pattern::Pattern">Pattern</a><'a>, </span></code><div class='since' title='Stable since Rust version 1.16.0'>1.16.0</div></span></h4>
|
||
<div class='docblock'><p>Replaces first N matches of a pattern with another string.</p>
|
||
|
||
<p><code>replacen</code> creates a new <a href="string/struct.String.html"><code>String</code></a>, and copies the data from this string slice into it.
|
||
While doing so, it attempts to find matches of a pattern. If it finds any, it
|
||
replaces them with the replacement string slice at most <code>count</code> times.</p>
|
||
|
||
<h1 id='examples-36' class='section-header'><a href='#examples-36'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">"foo foo 123 foo"</span>;
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"new new 123 foo"</span>, <span class="ident">s</span>.<span class="ident">replacen</span>(<span class="string">"foo"</span>, <span class="string">"new"</span>, <span class="number">2</span>));
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"faa fao 123 foo"</span>, <span class="ident">s</span>.<span class="ident">replacen</span>(<span class="string">'o'</span>, <span class="string">"a"</span>, <span class="number">3</span>));
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"foo foo new23 foo"</span>, <span class="ident">s</span>.<span class="ident">replacen</span>(<span class="ident">char</span>::<span class="ident">is_numeric</span>, <span class="string">"new"</span>, <span class="number">1</span>));</pre>
|
||
|
||
<p>When the pattern doesn't match:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">"this is old"</span>;
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>, <span class="ident">s</span>.<span class="ident">replacen</span>(<span class="string">"cookie monster"</span>, <span class="string">"little lamb"</span>, <span class="number">10</span>));</pre>
|
||
</div><h4 id='method.to_lowercase' class="method"><span id='to_lowercase.v' class='invisible'><code>fn <a href='#method.to_lowercase' class='fnname'>to_lowercase</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></code><div class='since' title='Stable since Rust version 1.2.0'>1.2.0</div></span></h4>
|
||
<div class='docblock'><p>Returns the lowercase equivalent of this string slice, as a new <a href="string/struct.String.html"><code>String</code></a>.</p>
|
||
|
||
<p>'Lowercase' is defined according to the terms of the Unicode Derived Core Property
|
||
<code>Lowercase</code>.</p>
|
||
|
||
<p>Since some characters can expand into multiple characters when changing
|
||
the case, this function returns a <a href="string/struct.String.html"><code>String</code></a> instead of modifying the
|
||
parameter in-place.</p>
|
||
|
||
<h1 id='examples-37' class='section-header'><a href='#examples-37'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">"HELLO"</span>;
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"hello"</span>, <span class="ident">s</span>.<span class="ident">to_lowercase</span>());</pre>
|
||
|
||
<p>A tricky example, with sigma:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">sigma</span> <span class="op">=</span> <span class="string">"Σ"</span>;
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"σ"</span>, <span class="ident">sigma</span>.<span class="ident">to_lowercase</span>());
|
||
|
||
<span class="comment">// but at the end of a word, it's ς, not σ:</span>
|
||
<span class="kw">let</span> <span class="ident">odysseus</span> <span class="op">=</span> <span class="string">"ὈΔΥΣΣΕΎΣ"</span>;
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"ὀδυσσεύς"</span>, <span class="ident">odysseus</span>.<span class="ident">to_lowercase</span>());</pre>
|
||
|
||
<p>Languages without case are not changed:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">new_year</span> <span class="op">=</span> <span class="string">"农历新年"</span>;
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">new_year</span>, <span class="ident">new_year</span>.<span class="ident">to_lowercase</span>());</pre>
|
||
</div><h4 id='method.to_uppercase' class="method"><span id='to_uppercase.v' class='invisible'><code>fn <a href='#method.to_uppercase' class='fnname'>to_uppercase</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></code><div class='since' title='Stable since Rust version 1.2.0'>1.2.0</div></span></h4>
|
||
<div class='docblock'><p>Returns the uppercase equivalent of this string slice, as a new <a href="string/struct.String.html"><code>String</code></a>.</p>
|
||
|
||
<p>'Uppercase' is defined according to the terms of the Unicode Derived Core Property
|
||
<code>Uppercase</code>.</p>
|
||
|
||
<p>Since some characters can expand into multiple characters when changing
|
||
the case, this function returns a <a href="string/struct.String.html"><code>String</code></a> instead of modifying the
|
||
parameter in-place.</p>
|
||
|
||
<h1 id='examples-38' class='section-header'><a href='#examples-38'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">"hello"</span>;
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"HELLO"</span>, <span class="ident">s</span>.<span class="ident">to_uppercase</span>());</pre>
|
||
|
||
<p>Scripts without case are not changed:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="kw">let</span> <span class="ident">new_year</span> <span class="op">=</span> <span class="string">"农历新年"</span>;
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">new_year</span>, <span class="ident">new_year</span>.<span class="ident">to_uppercase</span>());</pre>
|
||
</div><h4 id='method.escape_debug' class="method"><span id='escape_debug.v' class='invisible'><code>fn <a href='#method.escape_debug' class='fnname'>escape_debug</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></code></span></h4>
|
||
<div class='stability'><div class='stab unstable'><details><summary><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>str_escape</code>)</summary><p>return type may change to be an iterator</p>
|
||
</details></div></div><div class='docblock'><p>Escapes each char in <code>s</code> with <a href="primitive.char.html#method.escape_debug"><code>char::escape_debug</code></a>.</p>
|
||
</div><h4 id='method.escape_default' class="method"><span id='escape_default.v' class='invisible'><code>fn <a href='#method.escape_default' class='fnname'>escape_default</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></code></span></h4>
|
||
<div class='stability'><div class='stab unstable'><details><summary><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>str_escape</code>)</summary><p>return type may change to be an iterator</p>
|
||
</details></div></div><div class='docblock'><p>Escapes each char in <code>s</code> with <a href="primitive.char.html#method.escape_default"><code>char::escape_default</code></a>.</p>
|
||
</div><h4 id='method.escape_unicode' class="method"><span id='escape_unicode.v' class='invisible'><code>fn <a href='#method.escape_unicode' class='fnname'>escape_unicode</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></code></span></h4>
|
||
<div class='stability'><div class='stab unstable'><details><summary><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>str_escape</code>)</summary><p>return type may change to be an iterator</p>
|
||
</details></div></div><div class='docblock'><p>Escapes each char in <code>s</code> with <a href="primitive.char.html#method.escape_unicode"><code>char::escape_unicode</code></a>.</p>
|
||
</div><h4 id='method.repeat' class="method"><span id='repeat.v' class='invisible'><code>fn <a href='#method.repeat' class='fnname'>repeat</a>(&self, n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></code><div class='since' title='Stable since Rust version 1.16.0'>1.16.0</div></span></h4>
|
||
<div class='docblock'><p>Create a <a href="string/struct.String.html"><code>String</code></a> by repeating a string <code>n</code> times.</p>
|
||
|
||
<h1 id='examples-39' class='section-header'><a href='#examples-39'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class="rust rust-example-rendered">
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"abc"</span>.<span class="ident">repeat</span>(<span class="number">4</span>), <span class="ident">String</span>::<span class="ident">from</span>(<span class="string">"abcabcabcabc"</span>));</pre>
|
||
</div></div><h2 id='implementations'>Trait Implementations</h2><h3 class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html" title="trait core::ops::deref::Deref">__Deref</a> for <a class="struct" href="../glib/struct.KEY_FILE_DESKTOP_KEY_VERSION.html" title="struct glib::KEY_FILE_DESKTOP_KEY_VERSION">KEY_FILE_DESKTOP_KEY_VERSION</a></code></span><span class='out-of-band'></span></h3>
|
||
<div class='impl-items'><h4 id='associatedtype.Target' class="type"><span id='Target.t' class='invisible'><code>type <a href='https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html#associatedtype.Target' class="type">Target</a> = &'static <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code></span></h4>
|
||
<div class='docblock'><p>The resulting type after dereferencing</p>
|
||
</div><h4 id='method.deref' class="method"><span id='deref.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html#tymethod.deref' class='fnname'>deref</a>(&self) -> &&'static <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code></span></h4>
|
||
<div class='docblock'><p>The method called to dereference a value</p>
|
||
</div></div><h3 class='impl'><span class='in-band'><code>impl <a class="trait" href="../lazy_static/trait.LazyStatic.html" title="trait lazy_static::LazyStatic">LazyStatic</a> for <a class="struct" href="../glib/struct.KEY_FILE_DESKTOP_KEY_VERSION.html" title="struct glib::KEY_FILE_DESKTOP_KEY_VERSION">KEY_FILE_DESKTOP_KEY_VERSION</a></code></span><span class='out-of-band'></span></h3>
|
||
<div class='impl-items'><h4 id='method.initialize' class="method"><span id='initialize.v' class='invisible'><code>fn <a href='../lazy_static/trait.LazyStatic.html#tymethod.initialize' class='fnname'>initialize</a>(lazy: &Self)</code></span></h4>
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