Thank you for sharing your work! It looks quite wide-ranging and in depth.
For others, clickable links:
https://github.com/learnbyexample/learn_js_regexp
https://learnbyexample.github.io/books/
---
I love that you provide the books in a single-file Markdown format.
JavaScript Regular Expressions - https://github.com/learnbyexample/learn_js_regexp/blob/maste...
Python Regular Expressions - https://github.com/learnbyexample/py_regular_expressions/blo...
I use pandoc to convert markdown to pdf/epub and my initial learning with pandoc [1] resulted in single file usage. So, I kept it like that. I'm planning to create a separate chapter-wise branch so that I can publish a nicer web version with tools like mdBook [2]. This will require a bit of scripting to handle references across chapters.
[1] https://learnbyexample.github.io/tutorial/ebook-generation/c...