ial characters:
      </p>
<pre class="programlisting">.[{}()\*+?|^$</pre>
<h5>
<a name="boost_regex.syntax.basic_extended.h2"></a>
        <span class="phrase"><a name="boost_regex.syntax.basic_extended.wildcard"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.wildcard">Wildcard:</a>
      </h5>
<p>
        The single character '.' when used outside of a character set will match
        any single character except:
      </p>
<div class="itemizedlist"><ul class="itemi