Reverse and Dottify a Number for Enum

reverse_dottify.rb

#!/usr/bin/ruby
#5109926224
#4226299015
#4.2.2.6.2.9.9.0.1.5.1.e164.convorelay.com
#100 10  "u" "E2U+sip" "!^.*$!sip:[email protected]!".

raise "You need to add a 10D number to reverse and dottify as ARGV[0]" unless !ARGV.empty?
$num = ARGV[0]

def enum_reverse_dottify(num)
  raise "You need to provide a 10D number" unless strip_keys(num).length == 10
  
  num = strip_keys(num)
  count = 0
	return ((num.reverse).scan(/./).map{|val| val+"."}.join)+"1"
	  
end

def strip_keys(num)
  return num.to_s.gsub(/[\(\)\- ]/,'')
end

puts (enum_reverse_dottify($num))

# usage: ruby reverse_dottify.rb '(925) 726-3439'