Issues with the Alpha and Numeric validators have been fixed for UTF8 support:
phalcon/cphalcon#11386 phalcon/cphalcon#11374
However if you which to validate with whitespace or space characters then these validators may still come in handy.
<?php
class LoginForm extends Form
{
public function initialize($entity = null, $options = null)
{
$username = new Text('username', array(
'class' => 'form-control'
));
$username->setLabel('Username');
$username->addValidators(array(
new PresenceOf(array(
'message' => 'Please enter your username.',
)),
new AlphaNumericValidator(array(
'message' => 'Only Alpha, Numeric and Space characters please.',
'allowWhiteSpace' => true,
)),
new StringLength(array(
'max' => 100,
'messageMaximum' => 'Username is too long. Maximum 100 characters.',
)),
));
$this->add($username);
Pull requests are more than welcome!