正则表达式Check Email

在网上看到的一些代码

import java.util.regex.*;

public class CheckEmail {

    public static void main(String[] args) {
   
        System.out.println (checkmail("[e-mail]"));
        System.out.println (checkmail("www@.163.com"));
        System.out.println (checkmail("www@[e-mail]"));
        System.out.println (checkmail("[e-mail]"));
        System.out.println (checkmail("[e-mail]"));
        System.out.println (checkmail("[e-mail]"));
        System.out.println (checkmail("[e-mail]_"));
        System.out.println (checkmail("[e-mail]"));
        CheckEmail m = new CheckEmail();
        m.check("Csd@.mail.com");
        System.out.println (CheckEmail.checkmail("[e-mail]"));
    }
   
    public static boolean checkmail(String mail){
     System.out.print ("Email地址:"+mail+"\t合法性:");//只为显示方便,正常使用时删除
//     使用正则表达式验证~
     String regex = "^([a-z0-9A-Z]+[-|\\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\\.)+[a-zA-Z]{2,}$";
  Pattern p = Pattern.compile(regex);
  Matcher m = p.matcher(mail);
  return m.find();

 }
  public void check(String mail){
   System.out.println (checkmail(mail));
  }
}