[beefok]

I've always enjoyed reading this book that espouses this same idea:

Constructing Language Processors for Little Languages 1st Edition by Randy M. Kaplan [1].

It's no longer being produced, but used it's $6 or less.

It's dated, from 1994, but it is a fun enjoyable discussion on the benefit of tiny specific languages. It also has a nice tutorial on the use of lex and yacc.

[1] https://www.amazon.com/gp/product/0471597546