PHP user Registration Mailbox Validation Regular Expression method

Here can be used to 2 kinds of methods, one is to use Preg_match to verify, one is to use JS to judge.

First, the PHP method

The code is as follows	Copy Code
Preg_match ("/^[0-9a-za-z]+@" ([0-9a-za-z]+) [.]) +[a-z]{2,4}$/i ", $email);

How to use:

The code is as follows	Copy Code
<?php function Isemail ($email) { if (Preg_match (/^[0-9a-za-z]+@ ([0-9a-za-z]+) [.]) +[a-z]{2,4}$/i ", $email)) { Return ' is the mailbox '; } else{ Return ' not a mailbox '; } } ?>

or directly using if to judge:

The code is as follows	Copy Code
if (!preg_match (/^[0-9a-za-z]+@ ([0-9a-za-z]+) [.]) +[a-z]{2,4}$/i ", $email)) { Exit (' ERROR: E-mail format is wrong. <a href= "Javascript:history.back (-1);" > Return </a> '); }

Second, JS judgment method

Myreg =/^ ([a-za-z0-9]+[_|\_|\.]?) *[a-za-z0-9]+@ ([a-za-z0-9]+[_|\_|\.]?) *[a-za-z0-9]+\. [A-za-z] {2,4}$/;

How to use:

The code is as follows	Copy Code
<script type= "Text/javascript" > Function Isemail (val) { var myreg =/^ ([a-za-z0-9]+[_|\_|\.]?) *[a-za-z0-9]+@ ([a-za-z0-9]+[_|\_|\.]?) *[a-za-z0-9]+\. [A-za-z] {2,4}$/; if (!myreg.test (val)) Return ' not a mailbox '; Return ' is the mailbox '; }; Alert (Isemail (' i@julying.com ')); </script>

above PHP and JS two methods, according to our actual needs and project use, the old Chiang here used the first method.