PHP过滤常用标签的正则表达式

$str=preg_replace('/\x80-\xFF/', '', $str);//删除十六进制字符
$str=preg_replace('/\\x[0-9A-F]{2}/', '', $str);//删除十六进制形式的字符串

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$str=preg_replace("/\s+/", " ", $str); //过滤多余回车
$str=preg_replace("/<[ ]+/si","<",$str); //过滤<__("<"号后面带空格)
$str=preg_replace("/?–>/si","",$str); //注释
$str=preg_replace("/<(!.?)>/si","",$str); //过滤DOCTYPE
$str=preg_replace("/<(/?html. ?)>/si","",$str); //过滤html标签
$str=preg_replace("/<(/?br.?)>/si","",$str); //过滤br标签
$str=preg_replace("/<(/?head. ?)>/si","",$str); //过滤head标签
$str=preg_replace("/<(/?meta.?)>/si","",$str); //过滤meta标签
$str=preg_replace("/<(/?body. ?)>/si","",$str); //过滤body标签
$str=preg_replace("/<(/?link.?)>/si","",$str); //过滤link标签
$str=preg_replace("/<(/?form. ?)>/si","",$str); //过滤form标签
$str=preg_replace("/cookie/si","COOKIE",$str); //过滤COOKIE标签
$str=preg_replace("/<(applet.?)>(. ?)<(/applet.?)>/si","",$str); //过滤applet标签
$str=preg_replace("/<(/?applet. ?)>/si","",$str); //过滤applet标签
$str=preg_replace("/<(style.?)>(. ?)<(/style.?)>/si","",$str); //过滤style标签
$str=preg_replace("/<(/?style. ?)>/si","",$str); //过滤style标签
$str=preg_replace("/<(title.?)>(. ?)<(/title.?)>/si","",$str); //过滤title标签
$str=preg_replace("/<(/?title. ?)>/si","",$str); //过滤title标签
$str=preg_replace("/<(object.?)>(. ?)<(/object.?)>/si","",$str); //过滤object标签
$str=preg_replace("/<(/?objec. ?)>/si","",$str); //过滤object标签
$str=preg_replace("/<(noframes.?)>(. ?)<(/noframes.?)>/si","",$str); //过滤noframes标签
$str=preg_replace("/<(/?noframes. ?)>/si","",$str); //过滤noframes标签
$str=preg_replace("/<(i?frame.?)>(. ?)<(/i?frame.?)>/si","",$str); //过滤frame标签
$str=preg_replace("/<(/?i?frame. ?)>/si","",$str); //过滤frame标签
$str=preg_replace("/<(script.?)>(. ?)<(/script.?)>/si","",$str); //过滤script标签
$str=preg_replace("/<(/?script. ?)>/si","",$str); //过滤script标签
$str=preg_replace("/javascript/si","Javascript",$str); //过滤script标签
$str=preg_replace("/vbscript/si","Vbscript",$str); //过滤script标签
$str=preg_replace("/on([a-z]+)\s=/si","On\1=",$str); //过滤script标签
$str=preg_replace("/&#/si","&＃",$str); //过滤script标签，

$str = preg_replace( "@?)@is", "", $str ); //过滤script代码
$str = preg_replace( "@?)@is", "", $str );
$str = preg_replace( "@?)@is", "", $str );
$str = preg_replace( "@<(.?)>@is", "", $str );
?>