PHP email validation using regex

I keep seeing PHP where the programmer has written a regular expression to validate an email address.

Don't do that! Use the filter_var() function that php comes with out of the box.

<?php

$emailAddress = '[email protected]';



if (filter_var($emailAddress , FILTER_VALIDATE_EMAIL)) {

    echo $emailAddress,' is considered valid.';

}else{

    echo $emailAddress,' is considered invalid.';

}

?>

And if you want to tidy the email address up:

<?php

$sanitizedEmailAddress = filter_var($emailAddress, FILTER_SANITIZE_EMAIL);

?>

PHP   Validation