Pattrn

Fast immutable segmented-pattern matching for .NET 10.

Pattrn indexes segmented patterns once, then resolves matching inputs quickly and predictably. The core package is generic and dependency-light; string paths, dependency-injection helpers, and route-template syntax live in companion packages.

Pattrn is pre-beta. The public surface may still change while the core contracts are being exercised by real users.

Packages

Package	Purpose	Status
Pattrn	Core immutable segmented-pattern index.	Pre-beta stable candidate.
Pattrn.Strings	String splitting, normalization, and string-path ergonomics.	Pre-beta stable candidate.
Pattrn.DependencyInjection	Thin Microsoft.Extensions.DependencyInjection integration.	Pre-beta stable candidate.
Pattrn.Routing	Framework-neutral route-template parsing helpers built on the generic core.	Preview.

First-use example

using Pattrn;

var index = PattrnIndex<string, string>
    .Builder()
    .AddPattern(
        [
            PatternSegment<string>.Literal("orders"),
            PatternSegment<string>.Parameter("id")
        ],
        "order-handler",
        name: "orders-by-id")
    .Build();

var matches = index.MatchValuesToArray(["orders", "123"]);

Start with the docs hub

Use the documentation index for package guidance, tutorials, and the current behavior reference.

Key links:

• Documentation index
• Core package docs
• API overview
• Matching semantics
• Architecture decisions