ded.options"></a></span><a class="link" href="basic_extended.html#boost_regex.syntax.basic_extended.options">Options</a>
      </h4>
<p>
        There are a <a class="link" href="../ref/syntax_option_type/syntax_option_type_extended.html" title="Options for POSIX Extended Regular Expressions">variety
        of flags</a> that may be combined with the <code class="computeroutput"><span class="identifier">extended</span></code>
        and <code class="computeroutput"><span class="identifier">egrep</span></co