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

# ContentFilterEntry

A custom regex content filter that scans request messages for matching patterns.

## Fields

| Field     | Type                                                                              | Required             | Description                                                     | Example                    |
| --------- | --------------------------------------------------------------------------------- | -------------------- | --------------------------------------------------------------- | -------------------------- |
| `Action`  | [components.ContentFilterAction](../../models/components/contentfilteraction.mdx) | :heavy\_check\_mark: | Action taken when the pattern matches                           | block                      |
| `Label`   | optionalnullable.OptionalNullable\[`string`]                                      | :heavy\_minus\_sign: | Optional label used in redaction placeholders or error messages | \[API\_KEY]                |
| `Pattern` | `string`                                                                          | :heavy\_check\_mark: | A regex pattern to match against request content                | \b(sk-\[a-zA-Z0-9]\{48})\b |