Computer Science Canada

Email Validation
Author:  alpesh [ Sat Mar 10, 2007 7:57 am ]
Post subject:  Email Validation
Quote:

<?php

if (!isset($email)){
die("Host name value wasn't properly submitted.Retry.");
}

if(empty($email)) {
die("Hostname field was left blank ! Retry.");
}

if ( (strlen($email) < 3) || (strlen($email) > 200)) {
die("Invalid E-mail address, E-mail address too long or too short.");
} elseif(!ereg("@",$email)) {
die("Invalid E-mail address, no @ symbol found");
} else {
echo "<b>".$email."</b> is correct in format.<br>";
}

list($username,$hostname) = split("@",$email);

if ( (empty($username)) or (empty($hostname)) ) {
die("username or host name section is not valid.");
}

if(checkdnsrr($hostname)) {
echo "<b>". $email ."</b> hostname has a valid MX record !<br>";
} else {
die("<b>". $email ."</b> hostname does not exist");
}
?>
Author:  PaulButler [ Sat Mar 10, 2007 10:32 am ]
Post subject:  RE:Email Validation
Cool... but it looks like any character is accepted in the username part of the email addresss... From what I can tell, !@#$%^&*()_-=+@gmail.com would be considered a valid address.

I usually limit email checking to a simple regex like this:

php:

function validEmail($email){
     return preg_match('/^[a-z0-9_.+-]+@(?:[a-z0-9-]+\\.)+[a-z]{2,6}$/', $email);
}


I didn't know it would be so easy to verify that an MX record existed at the email's hostname... Maybe I will start doing that from now on.

:


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