Fix #379 snippet parse

autoload/neosnippet.vim

@@ -81,19 +81,19 @@ endfunction"}}}
 
 " Get marker patterns.
 function! neosnippet#get_placeholder_target_marker_pattern() abort "{{{
-  return '\${\d\+:\(#:\)\?TARGET\%(:.\{-}\)\?\\\@<!}'
+  return '\%(\\\@<!\|\\\\\zs\)\${\d\+:\(#:\)\?TARGET\%(:.\{-}\)\?\\\@<!}'
 endfunction"}}}
 function! neosnippet#get_placeholder_marker_pattern() abort "{{{
   return '<`\d\+\%(:.\{-}\)\?\\\@<!`>'
 endfunction"}}}
 function! neosnippet#get_placeholder_marker_substitute_pattern() abort "{{{
-  return '\${\(\d\+\%(:.\{-}\)\?\\\@<!\)}'
+  return '\%(\\\@<!\|\\\\\zs\)\${\(\d\+\%(:.\{-}\)\?\\\@<!\)}'
 endfunction"}}}
 function! neosnippet#get_placeholder_marker_substitute_nonzero_pattern() abort "{{{
-  return '\${\([1-9]\d*\%(:.\{-}\)\?\\\@<!\)}'
+  return '\%(\\\@<!\|\\\\\zs\)\${\([1-9]\d*\%(:.\{-}\)\?\\\@<!\)}'
 endfunction"}}}
 function! neosnippet#get_placeholder_marker_substitute_zero_pattern() abort "{{{
-  return '\${\(0\%(:.\{-}\)\?\\\@<!\)}'
+  return '\%(\\\@<!\|\\\\\zs\)\${\(0\%(:.\{-}\)\?\\\@<!\)}'
 endfunction"}}}
 function! neosnippet#get_placeholder_marker_default_pattern() abort "{{{
   return '<`\d\+:\zs.\{-}\ze\\\@<!`>'

autoload/neosnippet/view.vim

@@ -58,20 +58,16 @@ function! neosnippet#view#_insert(snippet, options, cur_text, col) abort "{{{
     let snip_word = s:eval_snippet(snip_word)
   endif
 
-  " Substitute escaped `.
-  let snip_word = substitute(snip_word, '\\`', '`', 'g')
-
   " Substitute markers.
   let snip_word = substitute(snip_word,
-        \ '\\\@<!'.neosnippet#get_placeholder_marker_substitute_pattern(),
+        \ neosnippet#get_placeholder_marker_substitute_pattern(),
         \ '<`\1`>', 'g')
   let snip_word = substitute(snip_word,
-        \ '\\\@<!'.neosnippet#get_mirror_placeholder_marker_substitute_pattern(),
+        \ neosnippet#get_mirror_placeholder_marker_substitute_pattern(),
         \ '<|\1|>', 'g')
-  let snip_word = substitute(snip_word,
-        \ '\\'.neosnippet#get_mirror_placeholder_marker_substitute_pattern().'\|'.
-        \ '\\'.neosnippet#get_placeholder_marker_substitute_pattern(),
-        \ '\=submatch(0)[1:]', 'g')
+
+  " Substitute escaped characters.
+  let snip_word = substitute(snip_word, '\\\\', '\\', 'g')
 
   " Insert snippets.
   let next_line = getline('.')[a:col-1 :]

syntax/neosnippet.vim

@@ -42,7 +42,7 @@ syntax match   neosnippetWord
       \ '^\s\+.*$' contains=
       \neosnippetEval,neosnippetPlaceHolder,neosnippetEscape,neosnippetVariable
 syntax match   neosnippetPlaceHolder
-      \ '\\\@<!\${\d\+\%(:.\{-}\)\?\\\@<!}'
+      \ '\%(\\\@<!\|\\\\\zs\)\${\d\+\%(:.\{-}\)\?\\\@<!}'
       \ contained contains=neosnippetPlaceHolderComment
 syntax match   neosnippetVariable
       \ '\\\@<!\$\d\+' contained