public function query($match)
    {
        $keys    = $this->index->getKeys();
        $matches = array_filter($keys, function($key) use ($match) {
            return preg_match("/{$match}/i", $key);
        });

        $results = [];
        foreach ($matches as $match) {
            $result = $this->get($match);
            $results[key($result)] = current($result);
        }

        return $results;
    }