Turing RegEx Cleaner

cleaner.rb

class Cleaner
  def domain_from_email(email)
    email.match(/([\w+\-.]+)@([a-z\d\-.]+\.[a-z]{2,4}+)/)[2]
  end

  def area_code_only(phone_number)
    phone_number.match(/(\+*\d{1,})*([ |\(])*(\d{3})[^\d]*(\d{3})[^\d]*(\d{4})/)[3]
  end

  def get_secret_message(string)
    string.gsub(/([^a-z ])/i, "").downcase
  end
end