gistfile1.php

<?php

class user_create extends AnonymousModule
{
    protected $post = array(
        'username' => array(
            'length:>:32'           => 'Usernames may not be more than 32 characters.',
            'regex:/[^a-z0-9-]+/i'  => 'Usernames may only contain alphanumeric characters or dashes.',
            'regex:/^(-.+|.+-)$/'   => 'Usernames may not start or end with a dash.',
            'regex:/-{2,}/'         => 'Usernames may not have two or more dashes in a row.',
        ),
        'email' => array(
            'filter:validate_email' => 'Your email address is invalid.',
        ),
        'password' => array(
            'length:<:8'            => 'Passwords may not be less than 8 characters.',
        ),
    );