note 8814 added to strip_tags

A function to filter out anything except "nice" HTML; ie TITLE tags (nasty) are escaped, while B tags are left alone. Doesn't try to validate though (make sure tages are closed/nested) function escapeBadHTML($str) { $allowed = "br|b|i|p|u|a"; $str = preg_replace("/< # match the open bracket ( # begin gathering (?! # followed by anything except... \/? # maybe a slash... ($allowed) # and one of the allowed chunks... \b # and a word boundary. ) # [^>]* # and any of not-">"'s ) # end gathering > # followed by the > /xis", "&lt;\\1&gt;", $str); return $str; } http://www.php.net/manual/function.strip-tags.php