.net like format function for strings in javascript

format.js

var formatFunc = function format() {
		// slice 1st parameter which is pattern
		var args = Array.prototype.slice.call(arguments, 1),
			pattern = arguments[0];

		return pattern.replace(/{(\d+)}/g, function (match, number) { 
			return typeof args[number] != 'undefined' ? args[number] : match;
		});
	};