Comment.php

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<?php
namespace Magento\Config\Model\Config\Parser;

use Magento\Config\Model\Placeholder\Environment;
use Magento\Config\Model\Placeholder\PlaceholderInterface;
use Magento\Framework\App\Config\CommentParserInterface;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\App\Filesystem\DirectoryList;
use Magento\Framework\Exception\FileSystemException;
use Magento\Framework\Filesystem;

class Comment implements CommentParserInterface
{
    private $filesystem;

    private $placeholder;

    public function __construct(
        Filesystem $filesystem,
        PlaceholderInterface $placeholder
    ) {
        $this->filesystem = $filesystem;
        $this->placeholder = $placeholder;
    }

    public function execute($fileName)
    {
        $fileContent = $this->filesystem
            ->getDirectoryRead(DirectoryList::CONFIG)
            ->readFile($fileName);

        $pattern = sprintf('/\s+\*\s+(?P<placeholder>%s.*?)\s/', preg_quote(Environment::PREFIX));
        preg_match_all($pattern, $fileContent, $matches);

        if (!isset($matches['placeholder'])) {
            return [];
        }

        $configs = [];
        foreach ($matches['placeholder'] as $placeholder) {
            $path = $this->placeholder->restore($placeholder);
            $path = preg_replace('/^' . ScopeConfigInterface::SCOPE_TYPE_DEFAULT . '\//', '', $path);
            $configs[$placeholder] = $path;
        }

        return $configs;
    }
}