/span></td><td>the englobing expression</td></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>1 if true 0 if false and -1 in case of failure.</td></tr></tbody></table></div></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlRegExecErrInfo"/>xmlRegExecErrInfo ()</h3><pre class="programlisting">int	xmlRegExecErrInfo		(<a href="libxml2-xmlregexp.html#xmlRegExecCtxtPtr">xml