Yep peg.el[1] is now built-into Emacs since 30.1 (which is how I came to know of it, but actually the library seems much older) and it makes certain things much simpler and faster to do than before (once you figure out its quirks).

[1] https://github.com/emacs-mirror/emacs/blob/master/lisp/progm...

> PEGs (even outside Janet) are amazing […] worth learning!

Actually, the opposite is the case. https://news.ycombinator.com/item?id=32316375

HN readers, don't fall into this trap and waste your time.

Ah yes, I, the non-python programmer, find PEGs useful and good because of checks notes Guido, somehow? What a ridiculous comment.