C# has compile-time regex, which are turned into fairly reasonable code doing the matching you can even inspect. The main goal isn't to have the syntax verified

C# has compile-time regex, which are turned into fairly reasonable code doing the matching you can even inspect. The main goal isn't to have the syntax verified during compilation (technically it happens even during editing the code), but rather to reduce either dependencies on complex code at runtime, while still maintaining good performance by using the complex regex.