Question

How can I make a rule at Yii Framework to allow only characters a-z, underline and dash in username field?

Thanks

Answer 1

You should be able to use the match/pattern rule outlined in the manual:

public function rules() {
    return array(
        array('username', 'required'),
        array(
            'username',
            'match', 'not' => true, 'pattern' => '/[^a-zA-Z_-]/',
            'message' => 'Invalid characters in username.',
        ),
    );
}

This, untested code, will require the username field to contain data and then validate that it doesn’t contain a character not in the accepted-character list (a-z, underscore, and dash).