Is there a gem that normalizes and format US phone numbers in ruby?

Question

I was using phony to format phone numbers (meaning, if I put in xxx-xxx-xxxx it would convert to a string, and also tell if there is a (1) before to remove it).

But

Answer 1

I wrote this regex to match NANPA phone numbers with some conventions (e.g. for extensions) for PHP (thank god those days are over) and converted it over to a Rails validator a few months ago for a project. It works great for me, but it is more pragmatic than strictly to spec.

# app/validators/phone_number_validator.rb
class PhoneNumberValidator < ActiveModel::EachValidator
  @@regex = %r{\A(?:1(?:[. -])?)?(?:\((?=\d{3}\)))?([2-9]\d{2})(?:(?<=\(\d{3})\))? ?(?:(?<=\d{3})[.-])?([2-9]\d{2})[. -]?(\d{4})(?: (?:ext|x)\.? ?(\d{1,5}))?\Z}

  def validate_each (object, attribute, value)
    if m = value.match(@@regex)
      # format the phone number consistently
      object.send("#{attribute}=", "(#{m[1]}) #{m[2]}-#{m[3]}")
    else
      object.errors[attribute] << (options[:message] || "is not an appropriately formatted phone number")
    end
  end
end

# app/models/foobar.rb
class Foobar < ActiveRecord::Base
  validates :phone, phone_number: true
end

The saved/outputted format is like this: (888) 888-8888. Currently the output strips off the extension because I didn't need it. You can add it back in and change the format pretty easily (see the object.send line.