php 正则匹配域名后的整个链接和只匹配域名

$pattern="/[.]{1}[a-z\d\-]+[.]{1}[a-z\d]*/";//只匹配域名
$pattern="/[.]{1}[a-z\d\-]+[.]{1}[a-z\d]*[\/]*[A-Za-z\d]*[\/]*[A-Za-z\d]*/";//匹配域名后整个链接