></td>
<td><p>Expr is the type of a static regular expression. </p></td>
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<td><p><span class="term">Postconditions:</span></p></td>
<td>
<p>regex_id() != 0 </p>
<p>mark_count() &gt;= 0 </p>
</td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout">basic_regex&amp; <a name="idp114740688-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><a class="link" href="basic_regex.html" title="Struct template basic_regex">b