Regular expressions help

[edeltatc2]

I am new to php regular expressions. What I am attempting to do is. extra the domain name from the url's users post to my site

I.E.

a users posts http://www.whatever.com

I would like to just end up with whatever.com stripping off the http://www. . Or if it was a subdomain such as http://pages.whatever.com I still would like to end up with whatever.com.

It's probably simple I just can't seem to get the http:// to come off.

[xblue]

Not to discourage you, but I don't think it is as simple as one would think. Consider http://domain.co.uk - no subdomain, but you'd probably wouldn't want to end up with co.uk, as would be likely to happen with a simple pattern. or imagine users entering a numeric IP instead...

Now here's a simple one for use with preg_replace, but mind the above

§^[url]http://[/url][^.]+\.§

it uses § as delimiter to keep you from escaping the slashes in [url]http://[/url] and will grab the first sequence of anything that is not a dot, followed by a dot (make sure you escape this one with a backslash).

[edited typo]

[jonno946]

try this, however it will only support the domain extensions defined:

[-a-zA-Z1-9]+[.](co.uk|net|com|org)

or i suppose this may work:

https?:\/\/www[.][-a-zA-Z1-9]+[.][.-a-zA-Z1-9]+

Jonno

[Installer]

Why not use "parse_url()"?

function get_domain_from_url($url)
{
    $parse = parse_url($url);
    $domain = str_replace('www.', '', $parse['host']);
    return $domain;
}

[edeltatc2]

Everyone had some very good points. I was especially interested in the parse url function

I think I got it

Thank You