Java Regex Issues

Scanner sc = new Scanner(System.in);

    static String getMenuInput(String scannerPattern) {
        String input = null;
        while (input == null) {
            input = sc.findInLine(scannerPattern);
            sc.nextLine();
        }
        return input;
    }

String menuInput;
menuInput = getMenuInput("B|R|Q"); // This works, returns value that can be used to navigate menu
menuInput = getMenuInput("0-9"); // This gets stuck in the loop (apparently not able to find pattern)