正则除去一些DIV内的内容

$htmls = <<<EOT<br />
<div id="content"><br />
     Main content.<br />
</div><br />
<div id="comment"><br />
	<ul><br />
		<li class="comment"><br />
			<div class="header-comment"><br />
				Comment:<br />
				<span class="date-comment">8/11/2012, 21:25</span><br />
			</div><br />
			<h4>Some Text</h4><br />
			<p class="test-comment">Blah~~ Blah~~ Blah~~</p><br />
			<div class="share"><br />
				<div class="vote"><br />
					<a class="vota yes" title="Like">2</a><br />
					<a class="vota no" title="Unlike">0</a><br />
				</div><br />
			</div><br />
		</li><br />
		<li class="comment"><br />
			<div class="header-comment"><br />
				Comment:<br />
				<span class="date-comment">8/11/2012, 23:08</span><br />
			</div><br />
			<h4>Other Text</h4><br />
			<p class="test-comment">Blah~~ Blah~~ Blah~~</p><br />
			<div class="share"><br />
				<div class="vote"><br />
					<a class="vota yes" title="Like">4</a><br />
					<a class="vota no" title="Unlike">0</a><br />
				</div><br />
			</div><br />
		</li>     <br />
     </ul><br />
</div><br />
EOT;<br />
<br />
$htmls = preg_replace('/<div[^>]*(comment|share)[^>]*>(.*?)<\/div>/is', '', $htmls);<br />
echo $htmls;

</div><br />
<div id="footer"><br />
     Footer content.<br />
</div><br />
EOT;