正则表达式之邮箱输入格式判断

package 正则表达式;

import java.util.Scanner;

public class test1 {

public static void main(String[] args) {

Scanner scan = new Scanner(system.in);

String s = scan.next();

boolean flag = s.matches("[a-z0-9]*[@][a-z0-9]*[.][a-z]*");

if(flag){ //@前面的数字@qq . com

System.out.println("输入的邮箱格式正确");

return ;

}else{

System.out.println("错误的邮箱格式！");

}

}

}