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

if the URL is in format http://www.google.com, then you could do something like:

a = 'http://www.google.com'
puts a.split(/\./)[1] + '.' + a.split(/\./)[2]

Or

a =~ /http:\/\/www\.(.*?)$/
puts $1