postcode validation (was Email validation)

[caroline_162]

Hello, this is my current code, take from the form validation part of my code. ATM it just checks if the email is valid. I was wondering if anyone could advise me how to make it so that it allows a email address not to be entered. but still validate anything that is entered. so it becomes an optional item on my form.

Thanks

 

 

if (!preg_match("/^[a-z]{1,2}[0-9]{1,2} [0-9]{1,2}[a-z]{1,2}$/i", $address_postcode)) {
print "Postcode needs to be in Se24 8IO Format ";

[Christian F.]

First of all I recommend using the filter_var () function, with the VALIDATE_EMAIL flag, to validate the e-mail address.

 

As for the conditional filtering, this is the perfect time to leverage the short-circuiting of the operators in PHP:

if (!empty ($address_postcode) && !filter_var ($address_postcode, VALIDATE_EMAIL)) {
   // Non-empty and failed validation.
}

[caroline_162]

Oh gosh I got that wrong !

I meant post code not email Sorry !

[cyberRobot]

In case it was missed, you could use the first part of Christian's if statement.

 

<?php
if(!empty ($address_postcode) && !preg_match("/^[a-z]{1,2}[0-9]{1,2} [0-9]{1,2}[a-z]{1,2}$/i", $address_postcode)) {
    print "Postcode needs to be in Se24 8IO Format ";
}
?>

[caroline_162]

Thanks for the help that worked perfectly !