Populate - Tiny Javascript Template Function, http://luwes.co/populate-tiny-javascript-template-function/

populate.js

String.prototype.populate = function(obj, funcs) {
    return this.replace(/\{\{\s*([^|\s}]+)\|?([^\s}]*)\s*\}\}/g, function(match, key, mods) {
		var str = obj[key];
		if (typeof str !== "undefined") {
			if (funcs && mods) {
				var arr = mods.split('|');
				for (var i = 0; i < arr.length; i++) {
					var mod = arr[i].split(':')[0];
					var par = arr[i].split(':')[1];
					var args = par ? par.split(',') : [];
					args.unshift(str);
					if (typeof funcs[mod] === "function") {
						str = funcs[mod].apply(str, args);
					}
				}
			}
			return str;
		} else {
			return match;
		}
  });
};