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Understanding JavaScript RegExp

Learn JavaScript Regular Expressions step-by-step from beginner to advanced levels with hundreds of examples and exercises. Visit https://youtu.be/8X-hUel3GxM for a short video about the book.

<p align="center"><img src="./images/js_regexp_ls.png" alt="Understanding JavaScript RegExp ebook cover image" /></p>

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

For solutions to the exercises, see Exercise_solutions.md.

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

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E-book

For a preview of the book, see sample chapters.

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

For the web version of the book, visit https://learnbyexample.github.io/learn_js_regexp/

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Testimonials

Literally was having a mini-breakdown about not understanding Regex in algorithm solutions the other day and now I'm feeling so much better, so thank YOU! I genuinely feel like I'm developing the skill for spotting when and where to use them after so much practice!

feedback on twitter

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Feedback

⚠️ ⚠️ Please DO NOT submit pull requests. Main reason being any modification requires changes in multiple places.

I would highly appreciate it if you'd let me know how you felt about this book. It could be anything from a simple thank you, pointing out a typo, mistakes in code snippets, which aspects of the book worked for you (or didn't!) and so on. Reader feedback is essential and especially so for self-published authors.

You can reach me via:

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Table of Contents

  1. Preface
  2. Why is it needed?
  3. RegExp introduction
  4. Anchors
  5. Alternation and Grouping
  6. Escaping metacharacters
  7. Dot metacharacter and Quantifiers
  8. Interlude: Tools for debugging and visualization
  9. Working with matched portions
  10. Character class
  11. Groupings and backreferences
  12. Interlude: Common tasks
  13. Lookarounds
  14. Unicode
  15. Further Reading
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Acknowledgements

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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.