></tr><tr><td><span class="term"><i><tt>sub</tt></i>:</span></td><td>the subexpression</td></tr><tr><td><span class="term"><i><tt>Returns</tt></i>:</span></td><td>the resulting expression or NULL in case of internal error, the result must be freed</td></tr></tbody></table></div><h3><a name="xmlExpFree" id="xmlExpFree"></a>Function: xmlExpFree</h3><pre class="programlisting">void	xmlExpFree			(<a href="libxml-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt, <br />					 <a href="libxml-xmlregexp.html#xml