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97 lines
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<title>Regular Expression Syntax</title>
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="boost_regex.syntax"></a><a class="link" href="syntax.html" title="Regular Expression Syntax">Regular Expression Syntax</a>
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</h2></div></div></div>
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<div class="toc"><dl class="toc">
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<dt><span class="section"><a href="syntax/perl_syntax.html">Perl Regular Expression
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Syntax</a></span></dt>
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<dt><span class="section"><a href="syntax/basic_extended.html">POSIX Extended Regular
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Expression Syntax</a></span></dt>
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<dt><span class="section"><a href="syntax/basic_syntax.html">POSIX Basic Regular
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Expression Syntax</a></span></dt>
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<dt><span class="section"><a href="syntax/character_classes.html">Character Class
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Names</a></span></dt>
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<dd><dl>
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<dt><span class="section"><a href="syntax/character_classes/std_char_classes.html">Character
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Classes that are Always Supported</a></span></dt>
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<dt><span class="section"><a href="syntax/character_classes/optional_char_class_names.html">Character
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classes that are supported by Unicode Regular Expressions</a></span></dt>
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</dl></dd>
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<dt><span class="section"><a href="syntax/collating_names.html">Collating Names</a></span></dt>
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<dd><dl>
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<dt><span class="section"><a href="syntax/collating_names/digraphs.html">Digraphs</a></span></dt>
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<dt><span class="section"><a href="syntax/collating_names/posix_symbolic_names.html">POSIX
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Symbolic Names</a></span></dt>
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<dt><span class="section"><a href="syntax/collating_names/named_unicode.html">Named
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Unicode Characters</a></span></dt>
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</dl></dd>
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<dt><span class="section"><a href="syntax/leftmost_longest_rule.html">The Leftmost
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Longest Rule</a></span></dt>
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</dl></div>
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<p>
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This section covers the regular expression syntax used by this library, this
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is a programmers guide, the actual syntax presented to your program's users
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will depend upon the flags used during expression compilation.
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</p>
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<p>
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There are three main syntax options available, depending upon how you construct
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the regular expression object:
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</p>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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<a class="link" href="syntax/perl_syntax.html" title="Perl Regular Expression Syntax">Perl (this is the default
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behavior)</a>.
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</li>
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<li class="listitem">
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<a class="link" href="syntax/basic_extended.html" title="POSIX Extended Regular Expression Syntax">POSIX extended (including
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the egrep and awk variations)</a>.
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</li>
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<li class="listitem">
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<a class="link" href="syntax/basic_syntax.html" title="POSIX Basic Regular Expression Syntax">POSIX Basic (including
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the grep and emacs variations)</a>.
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</li>
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</ul></div>
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<p>
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You can also construct a regular expression that treats every character as
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a literal, but that's not really a "syntax"!
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</p>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 1998-2013 John Maddock<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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</p>
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