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function getDuplicates(str)
var duplicates = "";
while (str.length > 0) {
// Adds a placeholder for the string at the current position before we run replace
var cur_str = str;
// Searches for all instances of char in string and replaces them with nothing
var regex = new RegExp(str[0], "g");
str = str.replace(regex, "");
// If the string differs by more than one we know that duplicates were found within the string
if (cur_str.length - str.length > 1) {
duplicates += cur_str[0];
// Returns a string of duplicates
return duplicates;
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