pan class="special">)[</span><span class="number">0</span><span class="special">].</span><span class="identifier">matched</span></code>
        is false.
      </p>
<p>
        The overloads that accept a string refer to a named sub-expression <span class="emphasis"><em>n</em></span>.
        In the event that there is no such named sub-expression then returns -1.
      </p>
<p>
        The template overloads of this function, allow the string and/or character
        type to be different from the character