url : http(s)?://([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?
email : \w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*

<code lang="PHP">
$address1 = "this is a text contain a url like this http://www.morad.info/";

$address2 = "this is a text contain a email adress like this damnlittletest@kamail.com";

if (eregi('http(s)?://([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?', $address1)) {
    echo "'$string' contains a URL";
}


if (eregi('\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*', $address2)) {
    echo "'$string' contains a e-Mail";
}

</code>