pig.rb

def translate(english)
  english.gsub(/[A-Za-z]+/) do |word|
    translate_word(word)
  end
end

def translate_word(english)
  first = english[0]
  remainder = english[1, english.length] 
  pig = remainder + first.downcase + 'ay'

  if /[[:upper:]]/.match(first)
    pig = pig.capitalize
  end

  pig
end

puts "\n"

{
	'hello' => 'ellohay',
  'bird' => 'irdbay',
  'hello world' => 'ellohay orldway',
  'Hello world' => 'Ellohay orldway',
  'Hello, world!!' => 'Ellohay, orldway!!',
}.each do |english, pig|
  translation = translate(english)
  grade = (translation == pig) ? 'OK!' : 'wrong.'
  puts "#{english} => #{translation} #{grade} (expected #{pig})"
end

puts "\n"