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]+"; //write your code here...... //matches方法:用于两个字符串之间的字符一一匹配,用于正则表达式的匹配 if(str.matches(emailMatcher)){ System.out.println("邮箱格式合法"); }else{ System.out.println("邮箱格式不合法"); } } }