How to validate a url in Rails

Question

Is there an easy way how to validate urls in Rails 4 without using a Gem?

I found the validate_url gem already but i dont actually want to use it, as I think there needs to be a built-in way of doing that

Answer 1

I found a good way to do validate an url in rails 4 with a method of the URI class.

class User < ActiveRecord::Base
    validates_format_of :url, :with => URI::regexp(%w(http https))
end