帮忙写个正则,该如何解决

帮忙写个正则

HTML code

<!--

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-->
<div class="abc def" id="aa">
<p>正则要抓取的内容
</p>
</div>

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PHP code

$s=
<p>正则要抓取的内容

</p><div class="aa">
fasdf
</div>
txt;
preg_match('/<div class="abc def">]*>(.*?)/is',$s,$m);
echo $m[1]; <div class="clear">
                 
              
              
        
            </div>
</div>

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