Spring MVC - @RequestMapping regex Examples

@Controller
@RequestMapping("/users")
public class UserControllerRegex {

    @RequestMapping("{id:[0-9]+}")
    public String handleAllUsersRequest (Model model, @PathVariable("id") String id) {
        System.out.println("user id digits " + id);
        model.addAttribute("userId", id);
        return "all-users";
    }

    @RequestMapping("{id:[a-z]+}")
    public String handleAllUsersRequest2 (Model model, @PathVariable("id") String id) {
        System.out.println("user id alphas " + id);
        model.addAttribute("userStringId", id);
        return "all-users";
    }
}