addElement('text', 'string', array( 'label' => 'Search string', 'description' => $form->translate('The string you want to search for'), 'required' => true, )); $form->addElement('text', 'replacement', array( 'label' => 'Replacement', 'description' => $form->translate('Your replacement string'), 'required' => true, )); } public function transform($value) { return str_replace($this->settings['string'], $this->settings['replacement'], $value); } }