<a class="link" href="../basic_regex.html" title="basic_regex"><code class="computeroutput"><span class="identifier">basic_regex</span></code></a>, so you can use any
          of:
        </p>
<pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">constant_name</span>
</pre>
<p>
          or
        </p>
<pre class="programlisting"><span class="identifier">boost</s