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转自：http://bbs.blueidea.com/thread-2706128-1-1.html

<script language = "JavaScript">
 HTMLCode="<p align='center' style=\''><p style=\''>"
 var Pattern=/^<p.*?(?!align).*?>/ig;//tag p without align
 HTMLCode=HTMLCode.replace(Pattern,"");
 alert(HTMLCode);
</script>

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http://bbs.blueidea.com/thread-454714-1-1.html