MessageFormat.NET

Uses a hand-written parser without regex or generator tools, with built-in caching that reduces parsing overhead for repeated patterns, as benchmarked in the README with up to 40% faster release builds.

Fully implements the Unicode Consortium's ICU MessageFormat specification, ensuring reliable and consistent message formatting for internationalization across languages and platforms.

Supports custom formatters for numbers, dates, and times via CustomValueFormatter or lambda-based approaches, allowing developers to tailor formatting to specific needs without modifying core library code.

Allows readable formatting of complex message patterns with nested blocks and flexible indentation, making it easier to maintain and debug ICU patterns directly in code.