   <span class="number">0</span></code> then returns the position
                    of the whole match. Returns <code class="computeroutput"><span class="identifier">RegEx</span><span class="special">::</span><span class="identifier">npos</span></code>
                    if the supplied index is invalid, or if the specified sub-expression
                    did not participate in the match.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <code class