protected function _emailCallback($matches) {
        // is like http://user:pass@domain.com ? Then we do not touch it.
        if ($matches[1]) {
            return $matches[0];
        }

        return $this->getParser()->getFilter('Email')->parse(array(
            'tag' => 'email',
            'attributes' => array()
        ), trim($matches[2]));
    }