remove value from comma separated values string

Question

I have a csv string like this \"1,2,3\" and want to be able to remove a desired value from it.

For example if I want to remove the value: 2, the output string should

Answer 1

function removeValue(list, value) {
  return list.replace(new RegExp(",?" + value + ",?"), function(match) {
      var first_comma = match.charAt(0) === ',',
          second_comma;

      if (first_comma &&
          (second_comma = match.charAt(match.length - 1) === ',')) {
        return ',';
      }
      return '';
    });
};


alert(removeValue('1,2,3', '1')); // 2,3
alert(removeValue('1,2,3', '2')); // 1,3
alert(removeValue('1,2,3', '3')); // 1,2