protected function _translate($matches)
    {
        $replacement = '';
        $translator = $this->getObject('translator');

        switch ($matches[0])
        {
            case 'D':
                $replacement = $translator->translate(strtoupper($this->_date->format('D')));
                break;

            case 'l':
                $replacement = $translator->translate(strtoupper($this->_date->format('l')));
                break;

            case 'F':
                $replacement = $translator->translate(strtoupper($this->_date->format('F')));
                break;

            case 'M':
                $replacement = $translator->translate(strtoupper($this->_date->format('F').'_SHORT'));
                break;
        }

        $replacement = preg_replace('/([a-z])/i', '\\\\$1', $replacement);

        return $replacement;
    }