Code snippets, example files and sample chapters are available on GitHub [3]

The book uses plenty of examples to showcase features one by one. BRE/ERE/PCRE(2)/Rust regular expressions are also covered from scratch.

Hope you find the book useful. I would be grateful for your feedback and suggestions.

[1] https://gumroad.com/l/gnugrep_ripgrep

[2] https://leanpub.com/gnugrep_ripgrep

[3] https://github.com/learnbyexample/learn_gnugrep_ripgrep