PHP regular filter html special characters

$str=preg_replace("/s+/", " ", $str); //Filter excess carriage returns$str=preg_replace("/<[ ]+/si", "<",$str); //Filter <__("<" with a space after it) $str=preg_replace("//si","",$ str); //Comment $str=preg_replace("/<(!.*?)>/si","",$str); //Filter DOCTYPE $str=preg_replace("/<(/? html.*?)>/si","",$str); //Filter html tags$str=preg_replace("/<(/?br.*?)>/si","",$ str); //Filter the br tag $str=preg_replace("/<(/?head.*?)>/si","",$str); //Filter the head tag $str=preg_replace("/ <(/?meta.*?)>/si","",$str); //Filter meta tags $str=preg_replace("/<(/?body.*?)>/si" ,"",$str); //Filter the body tag $str=preg_replace("/<(/?link.*?)>/si","",$str); //Filter the link tag $str =preg_replace("/<(/?form.*?)>/si","",$str); //Filter form tags$str=preg_replace("/cookie/si","COOKIE",$ str); //Filter COOKIE tags $str=preg_replace("/<(applet.*?)>(.*?)<(/applet.*?)>/si","",$str ); //Filter applet tags $str=preg_replace("/<(/?applet.*?)>/si","",$str); //Filter applet tags $str=preg_replace("/< ;(style.*?)>(.*?)<(/style.*?)>/si","",$str); //Filter style tags $str=preg_replace("/< (/?style.*?)>/si","",$str); //Filter style tag $str=preg_replace("/<(title.*?)>(.*?)< (/title.*?)>/si","",$str); //Filter title tag $str=preg_replace("/<(/?title.*?)>/si","" ,$str); //Filter title tag $str=preg_replace("/<(object.*?)>(.*?)<(/object.*?)>/si","", $str); //Filter object tags $str=preg_replace("/<(/?objec.*?)>/si","",$str); //Filter object tags$str=preg_replace(" /<(noframes.*?)>(.*?)<(/noframes.*?)>/si","",$str); //Filter noframes tag $str=preg_replace("/ <(/?noframes.*?)>/si","",$str); //Filter the noframes tag $str=preg_replace("/<(i?frame.*?)>(.* ?)<(/i?frame.*?)>/si","",$str); //Filter frame tag $str=preg_replace("/<(/?i?frame.*?) >/si","",$str); //Filter frame tag$str=preg_replace("/<(script.*?)>(.*?)<(/script.*?)> ;/si","",$str); //Filter script tags $str=preg_replace("/<(/?script.*?)>/si","",$str); //Filter script tag $str=preg_replace("/javascript/si","Javascript",$str); //Filter script tag $str=preg_replace("/vbscript/si","Vbscript",$str); //Filter script tag $str=preg_replace("/on([a-z]+)s*=/si","On\1=",$str); //Filter script tag $str=preg_replace("//si ","",$str); //Filter script tag

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