Crie uma fábrica de regras com Pimf_Util_Validator

 $attributes = array(
'fname' => 'conan',
'age' => 33,
'birth' => '12-12-2040',
'monitor' => 'sonyT2000',
);

$rules
= array(
'fname' => 'alpha|length[>,0]|lengthBetween[1,9]',
'age' => 'digit|value[>,18]|value[=,33]',
'birth' => 'length[>,0]|date[mm-dd-yyyy]',
'monitor' => 'alphaNumeric'
);

$validator
= Pimf_Util_Validator::factory($attributes, $rules);

//...
$validator
->getErrors();
$validator
->getErrorMessages();