></a>
        <span class="phrase"><a name="boost_regex.syntax.basic_extended.character_ranges"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.character_ranges">Character
        ranges:</a>
      </h6>
<p>
        For example <code class="computeroutput"><span class="special">[</span><span class="identifier">a</span><span class="special">-</span><span class="identifier">c</span><span class="special">]</span></code>
        will match any single character in the range