How would you parse a url in Ruby to get the main domain?

Question

I want to be able to parse any url with ruby to get the main part of the domain without the www (just the XXXX.com)

Answer 1

Here's one that works better with .co.uk and .com.fr - type domains

domain = uri.host[/[^.\s\/]+\.([a-z]{3,}|([a-z]{2}|com)\.[a-z]{2})$/]