Yosymfony\Spress\Core\DataSource\Filesystem\FilesystemDataSource::isDateFilename PHP Method

    private function isDateFilename($filename)
    {
        if (preg_match('/(\\d{4})-(\\d{2})-(\\d{2})-(.+?)$/', $filename, $matches)) {
            return [$matches[1], $matches[2], $matches[3], $matches[4]];
        }
    }