Why the regex doesn't catch "Extra" group?

# Region
<tr>
\s*<td\s+class="grey11">Region:</td>\s*
<td\s+class="b11\s+b">(?<Region>.+?(?=</td>))</td>
\s*
</tr>
\s*

</table>
\s*

#Optional AD
(
<div\s+class="wid342\s+fl\s+padtop15">
\s*
<div\s+class="linkicon\s+listicon\s+lh16">
\s*
<a(?:[^>]*?)>
(?:.+?)</a>\s*</div>\s*</div>
){0,1}

</div>
\s*

(
# Amenities
<div\s+class="wid342\s+fl\s+mtop10(?:[^>]*?)>
\s*
<div\s+class="pad10">
(?:.+?)
<ul\s+class="chkbox">
(?<Amenities>.+?)
</ul>
\s*
</div>
){0,1}



(?:.+?)

#Extra
(
<div\s+class="b10\s+lh16\s+vpad10">
\s*(?<Extra>.+?)\s*
</div>
){0,1}