java正则表达式判断邮件地址是否合法详解编程语言

java正则表达式判断邮件地址是否合法

import java.util.regex.Matcher; 
import java.util.regex.Pattern; 
import java.util.Scanner; 
  
public class Email{ 
    public static void main(String []args){ 
        Scanner scan = new Scanner(System.in); 
        String str=null; 
        str = scan.next(); 
        String pat="[a-zA-Z0-9_//-//.]+@[a-zA-Z0-9]+(//.(com))"; 
        Pattern p = Pattern.compile(pat);//实例化Pattern类 
        Matcher m = p.matcher(str);//验证内容是否合法 
        if(m.matches()) 
          System.out.println("YES"); 
        else 
          System.out.println("NO"); 
    } 
}