Question

I have never used regex before and I was wondering how to write a regular expression in PHP that gets the domain of the URL. For example:
http://www.hegnar.no/bors/article488276.ece –> hegnar.no

Answer 1

Just use parse_url() if you are specifically dealing with URLs.

For example:

$url = "http://www.hegnar.no/bors/article488276.ece";
$url_u_want = parse_url($url, PHP_URL_HOST);

Docs

EDIT:
To take out the www. infront, use:

$url_u_want = preg_replace("/^www\./", "", $url_u_want);