library/ZF2ValidatorBuilder/ValidatorBuilder.php
protected function getElementValidatorChain(\Zend\Form\Element $element) {
        $elementName = $element->getAttribute('name');
        return $this->form->getInputFilter()->get($elementName)->getValidatorChain();
    }
protected function getElementValidatorChain(\Zend\Form\Element $element) {
        $elementName = $element->getAttribute('name');
        return $this->form->getInputFilter()->get($elementName)->getValidatorChain();
    }
Get elements validator chain
@param \Zend\Form\Element $element
@return \Zend\Validator\ValidatorChain