http://www.freecodecamp.com/nirajkrz 's solution for Bonfire: Spinal Tap Case

bonfire-spinal-tap-case.js

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

//Convert a string to spinal case. Spinal case is all-lowercase-words-joined-by-dashes.
function spinalCase(str) {
  // "It's such a fine line between stupid, and clever."
  // --David St. Hubbins
  // Create a variable for the white space and underscores.
  var regex = /\s+|_+/g;

  // Replace low-upper case to low-space-uppercase
  str = str.replace(/([a-z])([A-Z])/g, '$1 $2');

  // Replace space and underscore with -
  return str.replace(regex, '-').toLowerCase();
}

spinalCase('This Is Spinal Tap');