'validators' => array(new Zend_Validate_StringLength(0, 20),
new Zend_Validate_Regex('/^[a-zA-Z0-9_\.]+$/')),
'required' => true
'validators' => array(new Zend_Validate_StringLength(0, 20),
new Zend_Validate_Regex('/^[a-zA-Z0-9_\.]+$/')),
'required' => true