Replace string 'a , b,c' to 'a, b, c' using regex

How can I convert this string

a   ,  b,c,d , e,  f

to:

a, b, c, d, e, f

I’m trying this regex but it doesn’t do what I expected:

str.replace(/(\w)|(?:[ \t]+),(\w)|(?:[ \t]+)/g, "$1, $2")

>Solution :

You may use it this way:

var str = 'a   ,  b,c,d , e,  f';
console.log( str.replace(/\s*,\s*/g, ', ') );
//=> a, b, c, d, e, f

Here pattern \s*,\s* searches for a comma surrounded with 0 or more whitespaces on either side and we replace it with , to get our desired output.