return null;
            }
            final Matcher matcher = Pattern.compile(pattern, Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE).matcher(value);
            final StringBuffer buf = new StringBuffer(value.length() + 100);
            while (matcher.find()) {
                matcher.appendReplacement(buf, Matcher.quoteReplacement(highlightTagPre + matcher.group(0) + highlightTagPost));
            }

        final String pattern = "\"" + key + "\"\\s*:\\s*\"((?:[^\"\\\\]|\\\\.)*)\"";
        final java.util.regex.Pattern p = java.util.regex.Pattern.compile(pattern);
        final java.util.regex.Matcher m = p.matcher(stripCodeFences(json));
        if (m.find()) {
            return m.group(1).replace("\\\"", "\"").replace("\\\\", "\\");
        }
        return "";
    }

    /**

            propMap.put(CRAWLER_METADATA_CONTENT_EXCLUDES, patterns);
        }
        return !stream(patterns).get(stream -> stream.anyMatch(p -> p.matcher(name).matches()));
    }

    String getCrawlerMetadataNameMapping();

    default Tuple3<String, String, String> getCrawlerMetadataNameMapping(final String name) {
        @SuppressWarnings("unchecked")

            return new ChatSearchResult(Collections.emptyList(), null, 0L);
        }
        if (DANGEROUS_QUERY_PATTERN.matcher(query).find()) {
            logger.warn("[RAG] Rejected LLM-generated query with dangerous pattern. query={}", query);
            return new ChatSearchResult(Collections.emptyList(), null, 0L);
        }