PHP怎么用正则表达式匹配圆括号

 <span oncopy="setClipBoardData()"><p class="jianju">............</p><p></p></span>

<span[\s]oncopy="setClipBoardData\(\)"><p[\s]class="jianju">(.*)<\/p><p><\/p><\/span>

<span[\s]oncopy="setClipBoardData()"><p[\s]class="jianju">(.*)<\/p><p><\/p><\/span>

$html    =<<<DOC我在做CURL数据采集，要获取 <span oncopy="setClipBoardData()">
<p class="jianju">............</p>
<p>
</p>
</span>之间的内容，DOC;preg_match(&#39;/<span[\s]oncopy="setClipBoardData\(\)">
<p[\s]class="jianju">(.*)<\/p>
<p><\/p>
<\/span>/&#39;, $html, $m);
print_r($m[1]);