I also enjoyed the Treesitter talk from 5 years ago by Max Brunsfeld https://www.youtube.com/watch?v=Jes3bD6P0To

I'm currently building a query language whose grammar is very much inspired by Github's search syntax. I'm using Lezer, which is a GLR like Treesitter, so this talk learned me some parser generators (I've no formal CS education). Here's my grammar, a playground, and an example search query if anyone wants to play with it

https://github.com/AlexErrant/Pentive/blob/main/app/src/quer...

https://littletools.app/lezer

    -(a) spider-man -a b -c -"(quote\"d) str" OR "l o l" OR  a b c ((a "c") b) tag:what -deck:"x y"

I just converted the syntax tree to an abstract syntax tree so I can do De Morgan's law transformations. Literally the only time in my professional life where I feel like I'm solving a leetcode-style problem.