Other examples are CTRE (https://github.com/hanickadot/compile-time-regular-expressions https://github.com/hanickadot/compile-time-regular-expressio...) and for

Other examples are CTRE (https://github.com/hanickadot/compile-time-regular-expressions https://github.com/hanickadot/compile-time-regular-expressio...) and format string compilation (https://fmt.dev/12.0/api/#compile-api https://fmt.dev/12.0/api/#compile-api). The closest C counterpart is re2c which also requires external tooling.