Two regular expression verification methods for PHP user registered mailbox

Generally, when we register or log in to an account on the web, we need to verify not only whether the field is empty or long, but also whether it is in the format of the mailbox for some special fields, such as email, such as @ symbol. Just now, when practicing the PHP program script making member registration function, we used the mailbox account to verify the regular expression, which can filter the mailbox rules properly.

Here you can use two methods, one is to use preg_ One is to judge by JS.

First, PHP method

preg_ match(“/^[0-9a-zA-Z]+@(([0-9a-zA-Z]+)[.])+[a-z]{2,4}$/i”,$email );

Usage:

<?php
function isEmail($email){
if(preg_ match(“/^[0-9a-zA-Z]+@(([0-9a-zA-Z]+)[.])+[a-z]{2,4}$/i”,$email )){
Return ‘is a mailbox’; < br > the}      else{
Return ‘is not a mailbox’; < br > the}
}
?>

Or directly use if to judge:

if(!preg_ match(“/^[0-9a-zA-Z]+@(([0-9a-zA-Z]+)[.])+[a-z]{2,4}$/i”,$email )){
Error: email format error. <a href=”j avascript:history.back (- 1); “>return to <& A >‘”; < br > 1}

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}$/;

Usage:

<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 ‘is not a mailbox’

Return ‘is a mailbox’

};

alert( isEmail(‘ i@julying.com ‘) );

</script>

According to our actual needs and project use, we used the first method.

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