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  27 <a name="boost_regex.syntax"></a><a class="link" href="syntax.html" title="Regular Expression Syntax">Regular Expression Syntax</a>
  28 </h2></div></div></div>
  29 <div class="toc"><dl class="toc">
  30 <dt><span class="section"><a href="syntax/perl_syntax.html">Perl Regular Expression
  31       Syntax</a></span></dt>
  32 <dt><span class="section"><a href="syntax/basic_extended.html">POSIX Extended Regular
  33       Expression Syntax</a></span></dt>
  34 <dt><span class="section"><a href="syntax/basic_syntax.html">POSIX Basic Regular
  35       Expression Syntax</a></span></dt>
  36 <dt><span class="section"><a href="syntax/character_classes.html">Character Class
  37       Names</a></span></dt>
  38 <dd><dl>
  39 <dt><span class="section"><a href="syntax/character_classes/std_char_classes.html">Character
  40         Classes that are Always Supported</a></span></dt>
  41 <dt><span class="section"><a href="syntax/character_classes/optional_char_class_names.html">Character
  42         classes that are supported by Unicode Regular Expressions</a></span></dt>
  43 </dl></dd>
  44 <dt><span class="section"><a href="syntax/collating_names.html">Collating Names</a></span></dt>
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  46 <dt><span class="section"><a href="syntax/collating_names/digraphs.html">Digraphs</a></span></dt>
  47 <dt><span class="section"><a href="syntax/collating_names/posix_symbolic_names.html">POSIX
  48         Symbolic Names</a></span></dt>
  49 <dt><span class="section"><a href="syntax/collating_names/named_unicode.html">Named
  50         Unicode Characters</a></span></dt>
  51 </dl></dd>
  52 <dt><span class="section"><a href="syntax/leftmost_longest_rule.html">The Leftmost
  53       Longest Rule</a></span></dt>
  54 </dl></div>
  55 <p>
  56       This section covers the regular expression syntax used by this library, this
  57       is a programmers guide, the actual syntax presented to your program's users
  58       will depend upon the flags used during expression compilation.
  59     </p>
  60 <p>
  61       There are three main syntax options available, depending upon how you construct
  62       the regular expression object:
  63     </p>
  64 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
  65 <li class="listitem">
  66           <a class="link" href="syntax/perl_syntax.html" title="Perl Regular Expression Syntax">Perl (this is the default
  67           behavior)</a>.
  68         </li>
  69 <li class="listitem">
  70           <a class="link" href="syntax/basic_extended.html" title="POSIX Extended Regular Expression Syntax">POSIX extended (including
  71           the egrep and awk variations)</a>.
  72         </li>
  73 <li class="listitem">
  74           <a class="link" href="syntax/basic_syntax.html" title="POSIX Basic Regular Expression Syntax">POSIX Basic (including
  75           the grep and emacs variations)</a>.
  76         </li>
  77 </ul></div>
  78 <p>
  79       You can also construct a regular expression that treats every character as
  80       a literal, but that's not really a "syntax"!
  81     </p>
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