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

Addressable is probably the right answer in 2018, especially uses the PublicSuffix gem to parse domains.

However, I need to do this kind of parsing in multiple places, from various data sources, and found it a bit verbose to use repeatedly. So I created a wrapper around it, Adomain:

require 'adomain'

Adomain["https://toolbar.google.com"]
# => "toolbar.google.com"

Adomain["https://www.google.com"]
# => "google.com"

Adomain["stackoverflow.com"]
# => "stackoverflow.com"

I hope this helps others.