This will fix what duelafn was talking about. You can loop through it as many times to remove unwanted script tags and everything within it

$bool = true;
while ($bool) {
     $str = preg_replace('/<script\ .*?<\/.*?script>/i','', $str);
    if (!(preg_match('/<script\ .*?<\/.*?script>/i', $str))){
        $bool = false;
    }
}
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