Bolt\Storage\Query\ContentQueryParser::parseContent PHP Method

    protected function parseContent()
    {
        $contentString = strtok($this->query, '/');
        $content = [];
        $delim = '(),';
        $tok = strtok($contentString, $delim);
        while ($tok !== false) {
            $content[] = $tok;
            $tok = strtok($delim);
        }
        $this->contentTypes = $content;
    }