From: "Bartosz Dziewoński" <matma.rex@...>
Date: 2012-04-01T05:59:11+09:00
Subject: Re: Can't open url with a subdomain with an underscore

Well, you could also copy the patched URI::Parser#initialize_pattern
method to all your files that need it. (Just make sure to require
'uri' first, and monkeypatch later.) Like this:

require 'uri'
class URI::Parser
  def initialize_pattern(opts = {})
    <snip...>
  end
end

There is no other way to do it, without rewriting the entire URI
library from scratch. (And that would be stupid, even more so since
the way you want it to work is technically invalid.)

-- Matma Rex