Register.php: Restricting registrations to one e-mail domain

[teach1st]

In vBulletin 3.0x, I could insert this code in register.php to restrict registrations to my organization's e-mail domain:

PHP Code:

        // Check for vaild eMail domain
        if (!preg_match('/@(places\.)?pcsb\.org$/i', $_POST['email'])) {
          eval('$errors[30] = "' . fetch_phrase('bademail', PHRASETYPEID_ERROR) . '";');
        } 


It doesn't work in vBulletin 3.5 - test registrations with outside e-mail addresses are still allowed. I inserted the code before CHECK FOR MISSING FIELDS in each version.

I'm a php novice. What am I doing wrong? Thanks!