在java中验证用户名的正则表达式

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class UsernameValidator {
    private static final String USERNAME_REGEX = "^[a-zA-Z0-9_-]{3,16}$";

    public static boolean validateUsername(String username) {
        Pattern pattern = Pattern.compile(USERNAME_REGEX);
        Matcher matcher = pattern.matcher(username);
        return matcher.matches();
    }

    public static void main(String[] args) {
        String username = "my_username";
        if (validateUsername(username)) {
            System.out.println("Username is valid.");
        } else {
            System.out.println("Username is invalid.");
        }
    }
}