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199 lines
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HTML
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<title>regex::Captures - Rust</title>
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<a href='../regex/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a>
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<p class='location'>Struct Captures</p><div class="block items"><ul><li><a href="#methods">Methods</a></li><li><a href="#implementations">Trait Implementations</a></li></ul></div><p class='location'><a href='index.html'>regex</a></p><script>window.sidebarCurrent = {name: 'Captures', 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'>regex</a>::<wbr><a class="struct" href=''>Captures</a></span><span class='out-of-band'><span id='render-detail'>
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<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../src/regex/re_unicode.rs.html#894-898' title='goto source code'>[src]</a></span></h1>
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<pre class='rust struct'>pub struct Captures<'t> { /* fields omitted */ }</pre><div class='docblock'><p>Captures represents a group of captured strings for a single match.</p>
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<p>The 0th capture always corresponds to the entire match. Each subsequent
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index corresponds to the next capture group in the regex. If a capture
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group is named, then the matched string is <em>also</em> available via the <code>name</code>
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method. (Note that the 0th capture is always unnamed and so must be
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accessed with the <code>at</code> method.)</p>
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<p>Positions returned from a capture group are always byte indices.</p>
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<p><code>'t</code> is the lifetime of the matched text.</p>
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</div><h2 id='methods'>Methods</h2><h3 class='impl'><span class='in-band'><code>impl<'t> <a class="struct" href="../regex/struct.Captures.html" title="struct regex::Captures">Captures</a><'t></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/regex/re_unicode.rs.html#900-1000' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.pos' class="method"><span id='pos.v' class='invisible'><code>fn <a href='#method.pos' class='fnname'>pos</a>(&self, i: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <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.tuple.html">(</a><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.usize.html">usize</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a>></code></span></h4>
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<div class='docblock'><p>Returns the start and end positions of the Nth capture group. Returns
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<code>None</code> if <code>i</code> is not a valid capture group or if the capture group did
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not match anything. The positions returned are <em>always</em> byte indices
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with respect to the original string matched.</p>
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</div><h4 id='method.at' class="method"><span id='at.v' class='invisible'><code>fn <a href='#method.at' class='fnname'>at</a>(&self, i: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'t <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>></code></span></h4>
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<div class='docblock'><p>Returns the matched string for the capture group <code>i</code>. If <code>i</code> isn't
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a valid capture group or didn't match anything, then <code>None</code> is
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returned.</p>
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</div><h4 id='method.name' class="method"><span id='name.v' class='invisible'><code>fn <a href='#method.name' class='fnname'>name</a>(&self, name: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'t <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>></code></span></h4>
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<div class='docblock'><p>Returns the matched string for the capture group named <code>name</code>. If
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<code>name</code> isn't a valid capture group or didn't match anything, then
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<code>None</code> is returned.</p>
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</div><h4 id='method.iter' class="method"><span id='iter.v' class='invisible'><code>fn <a href='#method.iter' class='fnname'>iter</a>(&'t self) -> <a class="struct" href="../regex/struct.SubCaptures.html" title="struct regex::SubCaptures">SubCaptures</a><'t></code></span></h4>
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<div class='docblock'><p>Creates an iterator of all the capture groups in order of appearance
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in the regular expression.</p>
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</div><h4 id='method.iter_pos' class="method"><span id='iter_pos.v' class='invisible'><code>fn <a href='#method.iter_pos' class='fnname'>iter_pos</a>(&'t self) -> <a class="struct" href="../regex/struct.SubCapturesPos.html" title="struct regex::SubCapturesPos">SubCapturesPos</a><'t></code></span></h4>
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<div class='docblock'><p>Creates an iterator of all the capture group positions in order of
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appearance in the regular expression. Positions are byte indices
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in terms of the original string matched.</p>
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</div><h4 id='method.iter_named' class="method"><span id='iter_named.v' class='invisible'><code>fn <a href='#method.iter_named' class='fnname'>iter_named</a>(&'t self) -> <a class="struct" href="../regex/struct.SubCapturesNamed.html" title="struct regex::SubCapturesNamed">SubCapturesNamed</a><'t></code></span></h4>
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<div class='docblock'><p>Creates an iterator of all named groups as an tuple with the group
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name and the value. The iterator returns these values in arbitrary
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order.</p>
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</div><h4 id='method.expand' class="method"><span id='expand.v' class='invisible'><code>fn <a href='#method.expand' class='fnname'>expand</a>(&self, text: &<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></code></span></h4>
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<div class='docblock'><p>Expands all instances of <code>$name</code> in <code>text</code> to the corresponding capture
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group <code>name</code>.</p>
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<p><code>name</code> may be an integer corresponding to the index of the
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capture group (counted by order of opening parenthesis where <code>0</code> is the
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entire match) or it can be a name (consisting of letters, digits or
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underscores) corresponding to a named capture group.</p>
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<p>If <code>name</code> isn't a valid capture group (whether the name doesn't exist or
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isn't a valid index), then it is replaced with the empty string.</p>
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<p>To write a literal <code>$</code> use <code>$$</code>.</p>
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</div><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></span></h4>
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<div class='docblock'><p>Returns the number of captured groups.</p>
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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></span></h4>
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<div class='docblock'><p>Returns true if and only if there are no captured groups.</p>
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</div></div><h2 id='implementations'>Trait Implementations</h2><h3 class='impl'><span class='in-band'><code>impl<'t> <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../regex/struct.Captures.html" title="struct regex::Captures">Captures</a><'t></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/regex/re_unicode.rs.html#1002-1006' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span></h4>
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<div class='docblock'><p>Formats the value using the given formatter.</p>
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</div></div><h3 class='impl'><span class='in-band'><code>impl<'t> <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html" title="trait core::ops::index::Index">Index</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>> for <a class="struct" href="../regex/struct.Captures.html" title="struct regex::Captures">Captures</a><'t></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/regex/re_unicode.rs.html#1040-1046' title='goto source code'>[src]</a></span></h3>
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<div class='docblock'><p>Get a group by index.</p>
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<p><code>'t</code> is the lifetime of the matched text.</p>
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<p>The text can't outlive the <code>Captures</code> object if this method is
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used, because of how <code>Index</code> is defined (normally <code>a[i]</code> is part
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of <code>a</code> and can't outlive it); to do that, use <code>at()</code> instead.</p>
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<h1 id='panics' class='section-header'><a href='#panics'>Panics</a></h1>
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<p>If there is no group at the given index.</p>
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</div><div class='impl-items'><h4 id='associatedtype.Output' class="type"><span id='Output.t' class='invisible'><code>type <a href='https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html#associatedtype.Output' class="type">Output</a> = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code></span></h4>
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<div class='docblock'><p>The returned type after indexing</p>
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</div><h4 id='method.index' class="method"><span id='index.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html#tymethod.index' class='fnname'>index</a>(&self, i: <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></span></h4>
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<div class='docblock'><p>The method for the indexing (<code>container[index]</code>) operation</p>
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</div></div><h3 class='impl'><span class='in-band'><code>impl<'t, 'i> <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html" title="trait core::ops::index::Index">Index</a><&'i <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>> for <a class="struct" href="../regex/struct.Captures.html" title="struct regex::Captures">Captures</a><'t></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/regex/re_unicode.rs.html#1060-1066' title='goto source code'>[src]</a></span></h3>
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<div class='docblock'><p>Get a group by name.</p>
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<p><code>'t</code> is the lifetime of the matched text and <code>'i</code> is the lifetime
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of the group name (the index).</p>
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<p>The text can't outlive the <code>Captures</code> object if this method is
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used, because of how <code>Index</code> is defined (normally <code>a[i]</code> is part
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of <code>a</code> and can't outlive it); to do that, use <code>name</code> instead.</p>
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<h1 id='panics-1' class='section-header'><a href='#panics-1'>Panics</a></h1>
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<p>If there is no group named by the given value.</p>
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</div><div class='impl-items'><h4 id='associatedtype.Output-1' class="type"><span id='Output.t-1' class='invisible'><code>type <a href='https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html#associatedtype.Output' class="type">Output</a> = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code></span></h4>
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<div class='docblock'><p>The returned type after indexing</p>
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</div><h4 id='method.index-1' class="method"><span id='index.v-1' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html#tymethod.index' class='fnname'>index</a><'a>(&'a self, name: &'i <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>) -> &'a <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code></span></h4>
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<div class='docblock'><p>The method for the indexing (<code>container[index]</code>) operation</p>
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