* * * * * Tool selection So if I needed to parse data in C [1], why did I not use lex [2]? It's pretty much standard on all Unix systems, right? Yes, but all it does is lexical analysis. The job of parsing requires the use of yacc (yet another compiler- compiler) [3]. So why didn't I use yacc (yet another compiler-compiler)? Beacuse it doesn't do lexical analysis. If I use lex, I also need to use yacc. Why use two tools when one [4] will suffice? They are also both a pain to use, so it's not like I immediately think to use them (that, and the last time I used lex in anger was over twenty years ago …) [1] gopher://gopher.conman.org/0Phlog:2019/10/07.1 [2] https://en.wikipedia.org/wiki/Lex_(software) [3] https://en.wikipedia.org/wiki/Yacc [4] https://www.piumarta.com/software/peg/ Email author at sean@conman.org .