Regex to add a space after each comma in Javascript

Question

I have a string that is made up of a list of numbers, seperated by commas. How would I add a space after each comma using Regex?

Answer 1

Simplest Solution

"1,2,3,4".replace(/,/g, ', ')
//-> '1, 2, 3, 4'

Another Solution

"1,2,3,4".split(',').join(', ')
//-> '1, 2, 3, 4'

Answer 2

Use String.replace with a regexp.

> var input = '1,2,3,4,5',
     output = input.replace(/(\d+,)/g, '$1 ');
> output
  "1, 2, 3, 4, 5"