Add hyphens in the right places for phone numbers...simulates real time input

phone_numberize.rb

require 'test/unit'

class PhoneNumberizeTest < Test::Unit::TestCase
    
  # MM2: The one liner....and the one called by the tests
  #      yes it's ugly...I would probably not like to pick up someone else's code and see this ;)
  def phone_numberize(number)
    number.gsub(/#{/(\d{#{number.length-10}})/ if number.length>10}(\d{3})(\d{3})?(\d{1,4})/,"\\1-\\2-\\3-\\4").gsub("--","-").chomp("-")
  end
  
  # MM2: A long drawn out version...especially with the international twist...but it's more readable
  #      Not called by tests. Change the method name to test it.
  def phone_numberize2(number)
    number_string = "#{number}"
    
    if number.length > 10 
      international = /\d{#{number.length-10}}/ 
      really_long_match = number.match(/(#{international})(\d{3})(\d{3})(.+)/)
      if really_long_match
        number_string = "#{$1}-#{$2}-#{$3}-#{$4}"
      end
    elsif number.length > 6
      long_match = number.match(/(\d{3})(\d{3})(.+)/)
      if long_match
        number_string = "#{$1}-#{$2}-#{$3}"
      end
    elsif number.length > 3
      short_match = number.match(/(\d{3})(.+)/)
      if short_match
        number_string = "#{$1}-#{$2}"
      end      
    end
    
    number_string
  end
  
  def test_one_number
    assert_equal "4", phone_numberize("4")
  end  
  def test_two_numbers
    assert_equal "46", phone_numberize("46")
  end
  def test_three_numbers
    assert_equal "469", phone_numberize("469")
  end
  def test_four_numbers
    assert_equal "469-2", phone_numberize("4692")
  end
  def test_five_numbers
    assert_equal "469-23", phone_numberize("46923")
  end    
  def test_six_numbers
    assert_equal "469-236", phone_numberize("469236")
  end
  def test_seven_numbers
    assert_equal "469-236-9", phone_numberize("4692369")
  end
  def test_eight_numbers
    assert_equal "469-236-94", phone_numberize("46923694")
  end
  def test_nine_numbers
    assert_equal "469-236-948", phone_numberize("469236948")
  end
  def test_ten_numbers
    assert_equal "469-236-9488", phone_numberize("4692369488")
  end
  def test_eleven_numbers
    assert_equal "1-469-236-9488", phone_numberize("14692369488")
  end
  def test_twelve_numbers
    assert_equal "01-469-236-9488", phone_numberize("014692369488")
  end
  def test_thirteen_numbers
    assert_equal "001-469-236-9488", phone_numberize("0014692369488")
  end    
end