Get duplicate characters in string

Question

I try to match/get all repetitions in a string. This is what I\'ve done so far:

var str = \'abcabc123123\';
var REPEATED_CHARS_REGEX = /(.).*\\1/gi;

console         


        

Answer 1

The answer above returns more duplicates than there actually are. The second for loop causes the problem and is unnecessary. Try this:

function stringParse(string){
  var arr = string.split("");
  for(var i = 0; i