http://Pragprog.com is carrying Staffan Nöteberg's Regular Expressions Machinery; Covers TDD + regex. ❤️ the illustrations!

details: https://medium.com/pragmatic-programmers/37e7f70f8a4a
ebook: https://pragprog.com/titles/d-snrem
sample images: https://youtu.be/dRQwTF6eOu4