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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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<div class="toc"><dl>
<dt><span class="section"><a href="syntax/perl_syntax.html">Perl Regular Expression
      Syntax</a></span></dt>
<dt><span class="section"><a href="syntax/basic_extended.html">POSIX Extended Regular
      Expression Syntax</a></span></dt>
<dt><span class="section"><a href="syntax/basic_syntax.html">POSIX Basic Regular
      Expression Syntax</a></span></dt>
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        classes that are supported by Unicode Regular Expressions</a></span></dt>
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<p>
      This section covers the regular expression syntax used by this library, this
      is a programmers guide, the actual syntax presented to your program's users
      will depend upon the flags used during expression compilation.
    </p>
<p>
      There are three main syntax options available, depending upon how you construct
      the regular expression object:
    </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
          <a class="link" href="syntax/perl_syntax.html" title="Perl Regular Expression Syntax">Perl (this is the default
          behavior)</a>.
        </li>
<li class="listitem">
          <a class="link" href="syntax/basic_extended.html" title="POSIX Extended Regular Expression Syntax">POSIX extended (including
          the egrep and awk variations)</a>.
        </li>
<li class="listitem">
          <a class="link" href="syntax/basic_syntax.html" title="POSIX Basic Regular Expression Syntax">POSIX Basic (including
          the grep and emacs variations)</a>.
        </li>
</ul></div>
<p>
      You can also construct a regular expression that treats every character as
      a literal, but that's not really a "syntax"!
    </p>
</div>
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<td align="right"><div class="copyright-footer">Copyright &#169; 1998-2013 John Maddock<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        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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	24	</div>
	25	<div class="section">
	26	<div class="titlepage"><div><div><h2 class="title" style="clear: both">
	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>
	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>
	45	<dd><dl>
	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>
82	</div>
83	<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
84	<td align="left"></td>
85	<td align="right"><div class="copyright-footer">Copyright © 1998-2013 John Maddock<p>
86	Distributed under the Boost Software License, Version 1.0. (See accompanying
87	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>)
88	</p>
89	</div></td>
90	</tr></table>
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93	<a accesskey="p" href="partial_matches.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="syntax/perl_syntax.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a>
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