if (!preg_match('~^\d{4} ?\d{4} ?\d{4} ?\d{4}$~', $_POST["card_number"])) { $error .= "<p>Invalid card number.</p>";}
validates_inclusion_of :card_expiration_month, :in => 1..12
array('cardMonth', 'numerical', 'integerOnly'=>TRUE, 'min'=>1, 'max'=>12),
$form->addRule(Form::PATTERN, 'Invalid CC expiration month (mm)', '(0[1-9]{1})|(1[0-2]{1})');
čtvrtek, 20. září 12