验证邮箱合法性，正则表达式

<?php

$email="hchjhghg@163.com";

if(preg_match("/[a-zA-Z0-9]+@[a-zA-Z0-9]+\.[a-z]{2,4}",$email))

{

echo "yes";

}else

{

echo "no";

}

echo "email:".$email;

?>