protected static function isDelimiter(&$context) {
        if (preg_match('/^=\s*([^ ]+)\s+([^ ]+)\s*=$/', $context['currentToken'][Token::POS_INNERTAG], $matched)) {
            $context['usedFeature']['delimiter']++;
            Parser::setDelimiter($context, $matched[1], $matched[2]);
            return true;
        }
    }