AccessList.php

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<?php
declare(strict_types=1);

namespace Magento\PageCache\Model\System\Config\Backend;

use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\Phrase;

class AccessList extends Varnish
{
    public function beforeSave()
    {
        parent::beforeSave();

        $value = $this->getValue();
        if (!is_string($value) || !preg_match('/^[\w\s\.\-\,\:]+$/', $value)) {
            throw new LocalizedException(
                new Phrase(
                    'Access List value "%1" is not valid. '
                    .'Please use only IP addresses and host names.',
                    [$value]
                )
            );
        }
    }
}