Kata from http://www.codewars.com/kata/520b9d2ad5c005041100000f

Simple Pig Latin

Move the first letter of each word to the end of it, then add 'ay' to the end of the word.

pigIt('Pig latin is cool'); //igPay atinlay siay oolcay

simplepiglatin.js

function pigIt(str){
  return str.replace(/\b(\w)(\w+)/g,function(w,f,l){return l+f+"ay";});
}