boost_regex.syntax.basic_extended.h12"></a>
        <span class="phrase"><a name="boost_regex.syntax.basic_extended.character_classes"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.character_classes">Character
        classes:</a>
      </h6>
<p>
        An expression of the form <code class="computeroutput"><span class="special">[[:</span><span class="identifier">name</span><span class="special">:]]</span></code>
        matches the named character class "name", for