Spinal Tap Case - Only Regex Solution

Tell us what’s happening:

So I couldn’t complete the challenge as I tried an all regex approach and took a hint.
Could anyone suggest an all regex approach using only split and not replace

Regex i had done :


But it doesnt match spaces only, without any uppercase character .Any advice?
Your code so far

function spinalCase(str) {
  // "It's such a fine line between stupid, and clever."
  // --David St. Hubbins
  return str.replace(/([a-z])([A-Z])/g, '$1 $2').split(/[\s_]+/g).join("-").toLowerCase();

spinalCase('This Is Spinal Tap');

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Link to the challenge:

Edit: Sorry I forgot you need to account for capital letters, I have amended it for you.

Try this as your regex:

  const regex = /[\W]|[\s]|[_]||(?=[A-Z])/g;

What I have done is said check for anything which is:

NOT a word [\W],
OR |,
IS a space [\s],
OR |,
IS an underscore [_],
OR |,
IS a word with a capital (?=[A-Z])

RegexPal is a great place to test your regexes. Take a note that I have used a lookahead for the final check, this says match expressions which are followed by a specified sequence, in our case, capital letter.

I’m sorry but your regex didn’t work , maybe it was miswritten :slight_smile:

Anway , I reached the following regex:


But it does work in AllThe-small Things case i,e. when uppercase letter is without any space

What is the rest of your code? It is passing all tests for me with the following:

function spinalCase(str) {
  const regex = /[\W]|[\s]|[_]|(?=[A-Z])/g;
  let newStr = str.split(regex);
  return newStr.join('-').toLowerCase();
1 Like

sorry i only tried your codeon regexpal website .
Appreciate your help.
Thank man

No problem, happy to help!

1 Like