# Page Not Found

The URL `detection/nightfalls-detector-library/regex-library` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [Does Nightfall have a regex library I can choose from?](https://help.nightfall.ai/detection_platform/faq/regex_library.md)
- [Regex Library](https://help.nightfall.ai/detection_platform/regex_library.md)
- [Create Regular Expression Detector](https://help.nightfall.ai/detection_platform/custom_detectors/regexp_detector.md)
- [Nightfall Detector Glossary](https://help.nightfall.ai/detection_platform/detection_glossary.md)
- [Create an Entity Detector using a Prompt](https://help.nightfall.ai/detection_platform/custom_detectors/create-an-entity-detector-using-a-prompt.md)

## How to find the correct page

If the exact page cannot be found, you can still retrieve the information using the documentation query interface.

### Option 1 — Ask a question (recommended)

Perform an HTTP GET request on the documentation index with the `ask` parameter:

```
GET https://help.nightfall.ai/detection_platform/faq/regex_library.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

### Option 2 — Browse the documentation index

Full index: https://help.nightfall.ai/sitemap.md

Use this to discover valid page paths or navigate the documentation structure.

### Option 3 — Retrieve the full documentation corpus

Full export: https://help.nightfall.ai/llms-full.txt

Use this to access all content at once and perform your own parsing or retrieval. It will be more expensive.

## Tips for requesting documentation

Prefer `.md` URLs for structured content, append `.md` to URLs (e.g., `/detection_platform/faq/regex_library.md`).

You may also use `Accept: text/markdown` header for content negotiation.