# PiiPatterns

> Tracon documentation. Tracon is a .NET package family that adds a control
> plane on Microsoft Agent Framework, published as NuGet packages that run
> inside your own ASP.NET Core application.
>
> Page: https://tracon.dev/api/tracon.piipatterns/
> Summary: PiiPatterns: The built-in pattern families for Tracon.PatternContentGuard.

<div class="api-provenance">Namespace Tracon · Assembly <code>Tracon.Core.dll</code></div>

The built-in pattern families for [Tracon.PatternContentGuard](/api/tracon/).

```csharp
[Flags]
public enum PiiPatterns
```

## Fields

`CreditCard = 4` 

A credit card number. It **uses Luhn validation**.

A plain `\d{16}` match would mask every order number and make the guard
impractical to use.

`Email = 1` 

An email address.

`Iban = 2` 

An IBAN: two-letter country code, two check digits, and 11 to 30 alphanumeric characters.

`None = 0` 

No pattern is enabled. This is the default.

`ProviderApiKey = 16` 

A provider API key pattern: `sk-…`, `ghp_…`, or `AKIA…`.

A user can accidentally put a key in a prompt. That prompt goes to the provider
and can enter the provider log.

`TurkishNationalId = 8` 

A Turkish national identification number. It **validates check digits**.

A random 11-digit value is not masked. Only a number that satisfies the tenth
and eleventh digit rules is masked.

## Remarks

Each family is enabled **independently**. Enabling them all together
compounds false-positive risk and can make the guard impractical to use.