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]+";

        //简洁做法：利用matches()方法进行正则匹配
        System.out.println(str.matches(emailMatcher)?"邮箱格式合法":"邮箱格式不合法");
        //常规做法：
        // if(str.matches(emailMatcher)){
        // System.out.print("邮箱格式合法");
        // }else{
        //     System.out.print("邮箱格式不合法");
        // }
    }
}