protected function getChoiceBySelection($selection)
    {
        preg_match('/^[^(]+\(([^\)]+)\)$/', $selection, $matches);
        if (count($matches) < 2) {
            return;
        }
        $username = $matches[1];
        foreach ($this->choices as $item) {
            if ($item->getUsername() === $username) {
                return $item;
            }
        }

        return;
    }