package com.nq.utils.email;

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

/**
 * @program: dabaogp
 * @description:
 * @create: 2025-09-16 12:00
 **/
public class EmailValidator {


    // 邮箱正则表达式
    private static final String EMAIL_REGEX =
            "^[a-zA-Z0-9_+&*-]+(?:\\.[a-zA-Z0-9_+&*-]+)*@" +
                    "(?:[a-zA-Z0-9-]+\\.)+[a-zA-Z]{2,7}$";

    // 编译正则表达式模式
    private static final Pattern pattern = Pattern.compile(EMAIL_REGEX);

    /**
     * 验证邮箱格式是否有效
     * @param email 待验证的邮箱地址
     * @return 如果邮箱格式有效返回true，否则返回false
     */
    public static boolean isValidEmail(String email) {
        if (email == null) {
            return false;
        }

        Matcher matcher = pattern.matcher(email);
        return matcher.matches();
    }

    // 测试方法
    public static void main(String[] args) {
        // 测试用例
        String[] testEmails = {
                "test@example.com",
                "user.name@example.com",
                "user.name+tag@example.com",
                "user@sub.example.co.uk",
                "invalid-email",
                "missing@domain",
                "@missingusername.com",
                "user@.com"
        };

        for (String email : testEmails) {
            System.out.println(email + " : " + (isValidEmail(email) ? "有效" : "无效"));
        }
    }

}