Detect repeating letter in an string in Javascript

Question

code for detecting repeating letter in a string.

var str=\"paraven4sr\";
var hasDuplicates = (/([a-zA-Z])\\1+$/).test(str)        
alert(\"repeating string \         


        

Answer 1

Try this:

var str = "paraven4sr";
function checkDuplicate(str){
    for(var i = 0; i < str.length; i++){
        var re = new RegExp("[^"+ str[i] +"]","g");
        if(str.replace(re, "").length >= 2){
            return true;
        }
    }
    return false;
}
alert(checkDuplicate(str));

Here is jsfiddle