Snippets Algorithms
Algorithms
Email Validator
by: Neil Sidlow
|
May 7, 2003
Version: 2.1
Type: Sample Code (HOWTO)
Category: Algorithms
License: GNU General Public License
Description: Will check to see if an email address is in the proper format.
<?php
function emailsyntax_is_valid($email) {
$to_work_out = explode("@", $email);
if (!isset($to_work_out[0])) return FALSE;
if (!isset($to_work_out[1])) return FALSE;
$pattern_local = '^([0-9a-z]*([-|_]?[0-9a-z]+)*)(([-|_]?)\.([-|_]?)[0-9a-z]*([-|_]?[0-9a-z]+)+)*([-|_]?)$';
$pattern_domain = '^([0-9a-z]+([-]?[0-9a-z]+)*)(([-]?)\.([-]?)[0-9a-z]*([-]?[0-9a-z]+)+)*\.[a-z]{2,4}$';
$match_local = eregi($pattern_local, $to_work_out[0]);
$match_domain = eregi($pattern_domain, $to_work_out[1]);
if ($match_local && $match_domain) {
return TRUE;
}
return FALSE;
}
?>
Use the function like this :
if (emailsyntax_is_valid($email)) {
echo "Ok";
}
or
if (!emailsyntax_is_valid($email)) {
echo "Invaild";
}
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