Removing subdomains from strings

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Hi.
I need to get the domain name and the .com/.net... etc.

For example:
foo.com > foo.com
www.foo.com > foo.com
somesubdomain.foo.com > foo.com
one.two.foo.com > foo.com

I need to get the foo.com part in all cases. What regexp/function could i use?
Thanks
Andres

-- 
Slds,
Andrés Santos Kunze, IIG
(593) 9 7026627


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