أقوى ال REGEX التى وجدتها فى جوجل
كود PHP:
// SCHEME
$urlregex = "^(https?|ftp)\:\/\/";
// USER AND PASS (optional)
$urlregex .= "([a-z0-9+!*(),;?&=\$_.-]+(\:[a-z0-9+!*(),;?&=\$_.-]+)?@)?";
// HOSTNAME OR IP
$urlregex .= "[a-z0-9+\$_-]+(\.[a-z0-9+\$_-]+)*"; // http://x = allowed (ex. http://localhost, http://routerlogin)
//$urlregex .= "[a-z0-9+\$_-]+(\.[a-z0-9+\$_-]+)+"; // http://x.x = minimum
//$urlregex .= "([a-z0-9+\$_-]+\.)*[a-z0-9+\$_-]{2,3}"; // http://x.xx(x) = minimum
//use only one of the above
// PORT (optional)
$urlregex .= "(\:[0-9]{2,5})?";
// PATH (optional)
$urlregex .= "(\/([a-z0-9+\$_-]\.?)+)*\/?";
// GET Query (optional)
$urlregex .= "(\?[a-z+&\$_.-][a-z0-9;:@/&%=+\$_.-]*)?";
// ANCHOR (optional)
$urlregex .= "(#[a-z_.-][a-z0-9+\$_.-]*)?\$";
// check
if (eregi($urlregex, $url)) {echo "good";} else {echo "bad";}