Ruby Regexp

Learn Ruby Regexp step by step from beginner to advanced levels with 200+ examples

The book also includes exercises to test your understanding, which is presented together as a single file in this repo - Exercises.md

See Version_changes.md to keep track of changes made to the book.

E-book

• You can download the book from any of these links for free (you can also pay if you wish)
  • https://leanpub.com/rubyregexp
  • https://gumroad.com/l/rubyregexp
• You can also get the book as bundles:
  • Awesome Regex bundle from https://leanpub.com/b/regex or https://gumroad.com/l/regex
  • (Python|Ruby) regex bundle from https://leanpub.com/b/pythonrubyregex
• See https://learnbyexample.github.io/books/ for list of other books

The book can also be viewed as a single markdown file in this repo. See my blogpost on generating pdf from markdown using pandoc if you are interested in the ebook creation process.

Feedback

Please open an issue if you spot any typo/errors.

I'd also highly appreciate your feedback about the book.

Goodreads: https://www.goodreads.com/book/show/48641238-ruby-regexp

Twitter: https://twitter.com/learn_byexample

Table of Contents

1. Preface
2. Why is it needed?
3. Regexp literal and operators
4. Anchors
5. Alternation and Grouping
6. Escaping metacharacters
7. Dot metacharacter and Quantifiers
8. Working with matched portions
9. Character class
10. Groupings and backreferences
11. Lookarounds
12. Modifiers
13. String Encoding
14. Miscellaneous
15. Gotchas
16. Further Reading

Acknowledgements

• ruby-lang documentation — manuals and tutorials
• /r/ruby/ — helpful forum for beginners and experienced programmers alike
• stackoverflow — for getting answers to pertinent questions on Ruby and regular expressions
• tex.stackexchange — for help on pandoc and tex related questions
• Cover image:
  • draw.io
  • tree icon by Gopi Doraisamy under Creative Commons Attribution 3.0 Unported
  • wand icon by roundicons.com
• Warning and Info icons by Amada44 under public domain
• softwareengineering.stackexchange and skolakoda for programming quotes

Special thanks to Allen Downey, an attempt at translating his book Think Python to Think Ruby gave me the confidence to publish my own book.

Contributing

• Open an issue for suggestions, bugs, typos, etc

License

The book is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License

The code snippets are licensed under MIT, see LICENSE file