> ## Documentation Index
> Fetch the complete documentation index at: https://docs.httpmon.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Filter syntax

> Quick and advanced filter expression reference

Press `/` in the flow list to focus the filter bar. Type your filter expression and results update in real time.

## Quick filter

Type any text to do a case-insensitive substring match on the host and path of each flow. No prefix needed.

```
api.example
```

This matches any flow whose host+path contains "api.example".

## Advanced expressions

Use a prefix to filter by a specific field.

| Prefix       | Description                  | Example                |
| ------------ | ---------------------------- | ---------------------- |
| `s:CODE`     | Status code (exact or range) | `s:200`, `s:2xx`       |
| `m:METHOD`   | HTTP method                  | `m:GET`, `m:POST`      |
| `ct:TYPE`    | Content-type substring       | `ct:json`, `ct:html`   |
| `re:PATTERN` | Regex on host+path           | `re:api/v[0-9]+`       |
| `!EXPR`      | Negate any expression        | `!s:4xx`, `!m:OPTIONS` |

Separate multiple terms with spaces. All terms are ANDed together.

```
s:2xx m:GET ct:json
```

This matches flows that have a 2xx status, use GET, and return JSON.

## Status code ranges

The `s:` prefix supports both exact codes and ranges using the `Nxx` format.

* `s:200` matches only 200 OK.
* `s:2xx` matches any status from 200 to 299.
* `s:4xx` matches any status from 400 to 499.
* `s:5xx` matches any status from 500 to 599.

## Examples

| Filter                | Matches                       |
| --------------------- | ----------------------------- |
| `api.example`         | URLs containing "api.example" |
| `s:200`               | 200 OK responses              |
| `s:2xx`               | All 2xx responses             |
| `m:POST`              | POST requests only            |
| `ct:json`             | JSON content-type             |
| `re:api/v[0-9]+`      | Versioned API paths           |
| `!s:4xx`              | Exclude 4xx errors            |
| `s:2xx m:GET ct:json` | 2xx GET requests with JSON    |