//Xxxxxxx xxxxx xxxxx (yyyyyy) xxxxxx x.
var text = "Xxxxxxx xxxxx xxxxx (yyyyyy) xxxxxx x.",
regex = /\((.+?)\)/,
result = regex.exec(text);
print(RegExp.$1);
Ly9YeHh4eHh4IHh4eHh4IHh4eHh4ICh5eXl5eXkpIHh4eHh4eCB4Lgp2YXIgdGV4dCA9ICJYeHh4eHh4IHh4eHh4IHh4eHh4ICh5eXl5eXkpIHh4eHh4eCB4LiIsCiAgICByZWdleCA9IC9cKCguKz8pXCkvLAogICAgcmVzdWx0ID0gcmVnZXguZXhlYyh0ZXh0KTsKcHJpbnQoUmVnRXhwLiQxKTs=