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  29 <h2><span class="refentrytitle">Global set</span></h2>
  30 <p>boost::xpressive::set &#8212; Used to create character sets. </p>
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  32 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  33 <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../xpressive/reference.html#header.boost.xpressive.regex_primitives_hpp" title="Header &lt;boost/xpressive/regex_primitives.hpp&gt;">boost/xpressive/regex_primitives.hpp</a>&gt;
  34
  35 </span><span class="emphasis"><em><span class="identifier">unspecified</span></em></span> set<span class="special">;</span></pre></div>
  36 <div class="refsect1">
  37 <a name="idm45555017202304"></a><h2>Description</h2>
  38 <p>There are two ways to create character sets with the 'set' identifier. The easiest is to create a comma-separated list of the characters in the set, as in (set= 'a','b','c'). This set will match 'a', 'b', or 'c'. The other way is to define the set as an argument to the set subscript operator. For instance, set[ 'a' | range('b','c') | digit ] will match an 'a', 'b', 'c' or a digit character.</p>
  39 <p>To complement a set, apply the '~' operator. For instance, ~(set= 'a','b','c') will match any character that is not an 'a', 'b', or 'c'.</p>
  40 <p>Sets can be composed of other, possibly complemented, sets. For instance, set[ ~digit | ~(set= 'a','b','c') ]. </p>
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  45 <td align="right"><div class="copyright-footer">Copyright &#169; 2007 Eric Niebler<p>
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