Spinal Tap Case problem

JavaScript
1

I dont understand why this isnt working.

Your code so far

function spinalCase(str) {
  
  var sign = /\s+|_+/g;
  var result;
  
  result='"'+str.replace(sign, "-").toLowerCase()+'"';
  
  
  return result;
}


spinalCase("Teletubbies say Eh-oh");

Your browser information:

Your Browser User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36.

Link to the challenge: