{"id":17614174,"url":"https://github.com/learnbyexample/learn_js_regexp","last_synced_at":"2025-05-06T14:32:59.861Z","repository":{"id":51253051,"uuid":"225803365","full_name":"learnbyexample/learn_js_regexp","owner":"learnbyexample","description":"Learn JavaScript Regular Expressions step-by-step from beginner to advanced levels with hundreds of examples and exercises.","archived":false,"fork":false,"pushed_at":"2023-10-26T05:12:31.000Z","size":3780,"stargazers_count":114,"open_issues_count":1,"forks_count":30,"subscribers_count":4,"default_branch":"master","last_synced_at":"2025-04-09T14:08:42.308Z","etag":null,"topics":["ebook","exercises","javascript","learn-by-doing","regex"],"latest_commit_sha":null,"homepage":"https://learnbyexample.github.io/learn_js_regexp/","language":"JavaScript","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"mit","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/learnbyexample.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null}},"created_at":"2019-12-04T07:13:55.000Z","updated_at":"2025-03-31T14:03:02.000Z","dependencies_parsed_at":"2024-01-07T03:40:07.900Z","dependency_job_id":"b36f2549-db8e-41ff-adda-bbc1f6861ba4","html_url":"https://github.com/learnbyexample/learn_js_regexp","commit_stats":null,"previous_names":[],"tags_count":0,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/learnbyexample%2Flearn_js_regexp","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/learnbyexample%2Flearn_js_regexp/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/learnbyexample%2Flearn_js_regexp/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/learnbyexample%2Flearn_js_regexp/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/learnbyexample","download_url":"https://codeload.github.com/learnbyexample/learn_js_regexp/tar.gz/refs/heads/master","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":252703467,"owners_count":21790891,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["ebook","exercises","javascript","learn-by-doing","regex"],"created_at":"2024-10-22T18:27:50.829Z","updated_at":"2025-05-06T14:32:59.533Z","avatar_url":"https://github.com/learnbyexample.png","language":"JavaScript","readme":"# Understanding JavaScript RegExp\n\nLearn 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.\n\n\u003cp align=\"center\"\u003e\u003cimg src=\"./images/js_regexp_ls.png\" alt=\"Understanding JavaScript RegExp ebook cover image\" /\u003e\u003c/p\u003e\n\nThe book also includes exercises to test your understanding, which are presented together as a single file in this repo — [Exercises.md](./Exercises.md).\n\nFor solutions to the exercises, see [Exercise_solutions.md](./Exercise_solutions.md).\n\nSee [Version_changes.md](./Version_changes.md) to keep track of changes made to the book.\n\n\u003cbr\u003e\n\n# E-book\n\n* You can purchase the pdf/epub versions of the book using these links:\n    * https://learnbyexample.gumroad.com/l/js_regexp\n    * https://leanpub.com/js_regexp\n* You can also get the book as part of these bundles:\n    * **All books bundle** bundle from https://learnbyexample.gumroad.com/l/all-books\n        * Includes all my programming books\n    * **Awesome Regex** bundle from https://learnbyexample.gumroad.com/l/regex or https://leanpub.com/b/regex\n* See https://learnbyexample.github.io/books/ for a list of other books\n\nFor a preview of the book, see [sample chapters](./sample_chapters/js_regexp_sample.pdf).\n\nThe book can also be [viewed as a single markdown file in this repo](./js_regexp.md). See my blogpost on [generating pdfs from markdown using pandoc](https://learnbyexample.github.io/customizing-pandoc/) if you are interested in the ebook creation process.\n\nFor the web version of the book, visit https://learnbyexample.github.io/learn_js_regexp/\n\n\u003cbr\u003e\n\n# Testimonials\n\n\u003eLiterally 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!\n\u003e\n\u003e — [feedback on twitter](https://twitter.com/codingwithlucy/status/1450668315635036160)\n\n\u003cbr\u003e\n\n# Feedback\n\n⚠️ ⚠️ Please DO NOT submit pull requests. Main reason being any modification requires changes in multiple places.\n\nI 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.\n\nYou can reach me via:\n\n* Issue Manager: [https://github.com/learnbyexample/learn_js_regexp/issues](https://github.com/learnbyexample/learn_js_regexp/issues)\n* E-mail: `echo 'bGVhcm5ieWV4YW1wbGUubmV0QGdtYWlsLmNvbQo=' | base64 --decode`\n* Twitter: [https://twitter.com/learn_byexample](https://twitter.com/learn_byexample)\n\n\u003cbr\u003e\n\n# Table of Contents\n\n1. Preface\n2. Why is it needed?\n3. RegExp introduction\n4. Anchors\n5. Alternation and Grouping\n6. Escaping metacharacters\n7. Dot metacharacter and Quantifiers\n8. Interlude: Tools for debugging and visualization\n9. Working with matched portions\n10. Character class\n11. Groupings and backreferences\n12. Interlude: Common tasks\n13. Lookarounds\n14. Unicode\n15. Further Reading\n\n\u003cbr\u003e\n\n# Acknowledgements\n\n* [MDN: Regular Expressions](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Regular_expressions) — documentation and examples\n* [/r/learnjavascript/](https://old.reddit.com/r/learnjavascript/) and [/r/regex/](https://old.reddit.com/r/regex/) — helpful forums for beginners and experienced programmers alike\n* [stackoverflow](https://stackoverflow.com/) — for getting answers to pertinent questions on JavaScript and regular expressions\n* [tex.stackexchange](https://tex.stackexchange.com/) — for help on [pandoc](https://github.com/jgm/pandoc/) and `tex` related questions\n* [canva](https://www.canva.com/) — cover image\n* [Warning](https://commons.wikimedia.org/wiki/File:Warning_icon.svg) and [Info](https://commons.wikimedia.org/wiki/File:Info_icon_002.svg) icons by [Amada44](https://commons.wikimedia.org/wiki/User:Amada44) under public domain\n* [oxipng](https://github.com/shssoichiro/oxipng), [pngquant](https://pngquant.org/) and [svgcleaner](https://github.com/RazrFalcon/svgcleaner) — optimizing images\n* [mdBook](https://github.com/rust-lang/mdBook) — for web version of the book\n    * [mdBook-pagetoc](https://github.com/JorelAli/mdBook-pagetoc) — for adding table of contents for each chapter\n    * [minify-html](https://github.com/wilsonzlin/minify-html) — for minifying html files\n\n\u003cbr\u003e\n\n# License\n\nThe book is licensed under a [Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License](https://creativecommons.org/licenses/by-nc-sa/4.0/).\n\nThe code snippets are licensed under MIT, see [LICENSE](./LICENSE) file.\n\n","funding_links":[],"categories":[],"sub_categories":[],"project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Flearnbyexample%2Flearn_js_regexp","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Flearnbyexample%2Flearn_js_regexp","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Flearnbyexample%2Flearn_js_regexp/lists"}