PHP 邮箱正则表达式代码 [ 新手入门 ]

<?php
$mail = 'runoob@runoob.com';  //邮箱地址
$pattern = "/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,})$/";
preg_match($pattern, $mail, $matches);
var_dump($matches);  //输出匹配结果
?>