题解 | #邮箱验证#

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        String str = scanner.next();
        String emailMatcher="[a-zA-Z0-9]+@[a-zA-Z0-9]+\\.[a-zA-Z0-9]+";

        //定义一个布尔值用于判断是否合法
       boolean flag= str.matches(emailMatcher);
       if(flag){
        System.out.print("邮箱格式合法");
       }
       else{
        System.out.print("邮箱格式不合法");
       }

    }
}