<?php $str="汉字123456abcdef+-*/ABCDE!@#$%^&*()结尾。"; $str=preg_replace("/[^\xa0-\xffa-zA-Z0-9]/",'',$str); echo $str; ?>
http://([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?
[a-z0-9]+@[a-z0-9]+\.(com|org|com.cn|cn)
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