spinaltapcase.js

// Bonfire: Spinal Tap Case
// Author: @codebubb
// Challenge: http://www.freecodecamp.com/challenges/bonfire-spinal-tap-case
// Learn to Code at Free Code Camp (www.freecodecamp.com)

function spinalCase(str) {
  // "It's such a fine line between stupid, and clever."
  // --David St. Hubbins
  return str.replace(/([a-z][A-Z])|\s|_/g, function(match){
    return match.length === 2 ? match[0] + "-" + match[1] : "-";
  }).toLowerCase();
}

spinalCase('This Is Spinal Tap');