small regex engine
Regex patterns can be compiled to byte arrays at compile time, which can be used at runtime to avoid re-compiling the regex and reducing code size by a lot, since all the compilation logic is not needed.
inaccurate benchmarks of mathing stirng green car pattern \s*?(red|green|blue)?\s*?(car|train)\s*?:
| engine | time |
|---|---|
| tpre | 0.___163 ms |
| pcre2 | 0.___785 ms |
| pcre2 (jit) | 0.____80 ms |
| GNU C++ regex | 0.___805 ms |