I'm reading this paper to follow along with this excellent implementation in Clojure of regular expression matching of sexps: https://github.com/cgrand/seqexp
Ghadi also made a version to parse PEG grammars but the VM is done in java i believe. Great talk about it:
I didn't know that Ken Thompson was one of the first programmers to implement regular expressions (in the QED editor for CTSS). That explains why there is so much use of regular expressions and pattern matching in Unix! Now it is quite common to see regular expressions in many tools and programming languages, but when I started using Unix in 1983 I was surprised to see so many uses of regular expressions.
Ghadi also made a version to parse PEG grammars but the VM is done in java i believe. Great talk about it:
talk: https://www.youtube.com/watch?v=9Q--oX5muxw project: https://github.com/ghadishayban/pex