Function Cek URL

============= Fungsi buat periksa Format URL
function validUrl($url){
        $format="/^(http|https):\/\/[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5}(([0-9]{1,5})?\/.*)?$/";
        $url=strtolower($url);
        if(preg_match($format,$url))
        return true; else return false;
}

============= Pas dicek di form
if(validUrl(document.telvistube.link.value)){
    alert("Format Link Anda Salah. Contoh Format : http://www.youtube.com/QyZZikn");
    form.link.focus();
    return (false);
}