> ## 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](../components/contentfilteraction.mdx) | :heavy\_check\_mark: | Action taken when the pattern matches | block |
| `label` | *OptionalNullable\[str]* | :heavy\_minus\_sign: | Optional label used in redaction placeholders or error messages | \[API\_KEY] |
| `pattern` | *str* | :heavy\_check\_mark: | A regex pattern to match against request content | \b(sk-\[a-zA-Z0-9]\{48})\b |