routput"><span class="identifier">collate</span></code>, <code class="computeroutput"><span class="identifier">nosubs</span></code>
        and <code class="computeroutput"><span class="identifier">icase</span></code> options</a>
        modify how the case and locale sensitivity are to be applied.
      </p>
<h4>
<a name="boost_regex.syntax.basic_extended.h32"></a>
        <span class="phrase"><a name="boost_regex.syntax.basic_extended.references"></a></span><a class="link" href="basic_extended.html#boost_