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;