c# like string.format() function for JavaScript

string-format.js

String.prototype.format = function () {
    var s = this,
        i = arguments.length;
    while (i--) {
        s = s.replace(new RegExp('\\{' + i + '\\}', 'gm'), arguments[i]);
    }
    return s;
};

//useage
var output = 'Hello {0}, how are you today? if you {1} let me know :)'.format('Orhan', 'not ok');