Rails helper that extracts the domain from a URL submitted to the function.

get_domain_from_url.rb

  # Use this helping to display the base domain name of a url
  # I am using it when displaying web results that are loaded from Social Search

  def get_host_without_www(url)
    require 'uri'
    uri = URI.parse(url)
    uri = URI.parse("http://#{url}") if uri.scheme.nil?
    host = uri.host.downcase
    host.start_with?('www.') ? host[4..-1] : host
  end