Extract url [PHP]

preg_match('/\\b(?P<subdomain>(?:[-a-z0-9]+\\.)+)?(?P<domain>(?P<host>[-a-z0-9]+)\\.(?P<tld>[a-z]{2,6}))/', $url, $result));

preg_match('/http:\/\/www.(.*?)./', $url, $result);

preg_match('/\\b(?P<subdomain>(?:[-a-z0-9]+\\.)+)?(?P<domain>(?P<host>[-a-z0-9]+)\\.(?P<tld>[a-z]{2,6}))/', $url, $result));

$var = str_replace(array('http://', 'www.'), '', $var);

$var = 'http://www.google.com';
$var = preg_replace("/(((http|ftp|https):\/\/)|(www\.?))/i", null, $var); 

echo $var; // will output google.com

preg_match('/\\b(?P<subdomain>(?:[-a-z0-9]+\\.)+)?(?P<domain>(?P<host>[-a-z0-9]+)\\.(?P<tld>[a-z]{2,6}))/', $url, $result);

$url = 'http://www.google.com/images/';

preg_match('#^(?:http://)(www\.?)?([^/]+)#i', $url , $matches);
// echo $matches[2];

<?php                   

$url = 'http://www.namepros.com/programming/282450-script-selling-script.html';

preg_match('/\\b(?P<subdomain>(?:[-a-z0-9]+\\.)+)?(?P<domain>(?P<host>[-a-z0-9]+)\\.(?P<tld>[a-z]{2,6}))/', $url, $result); 

print_r($result);
  
?>

Array ( 
[0] => www.namepros.com 
[subdomain] => www. 
[1] => www. 
[domain] => namepros.com 
[2] => namepros.com 
[host] => namepros 
[3] => namepros
[tld] => com 
[4] => com 
)