Validate.php

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<?php
namespace Magento\Variable\Controller\Adminhtml\System\Variable;

class Validate extends \Magento\Variable\Controller\Adminhtml\System\Variable
{
    public function execute()
    {
        $response = new \Magento\Framework\DataObject(['error' => false]);
        $variable = $this->_initVariable();
        $variable->addData($this->getRequest()->getPost('variable'));
        $result = $variable->validate();
        if ($result instanceof \Magento\Framework\Phrase) {
            $this->messageManager->addError($result->getText());
            $layout = $this->layoutFactory->create();
            $layout->initMessages();
            $response->setError(true);
            $response->setHtmlMessage($layout->getMessagesBlock()->getGroupedHtml());
        }
        $resultJson = $this->resultJsonFactory->create();
        return $resultJson->setData($response->toArray());
    }
}