         <p>
                    Specifies that when a regular expression is matched against a
                    character container sequence, then no sub-expression matches
                    are to be stored in the supplied <a class="link" href="../match_results.html" title="match_results"><code class="computeroutput"><span class="identifier">match_results</span></code></a> structure.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    optimize
       