>i</span>
                    <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="keyword">const</span><span class="special">;</span></code>
                  </p>
                </td>
<td>
                  <p>
                    Returns the position of what matched sub-expression <span class="emphasis"><em>i</em></span>.
                    If <code class="computeroutput"><span class="identifier">i</span> <span class="special">=</span>
                 