refrf.dev
An experimental book about regular expressions is available at refrf.dev in a visual format.
About refrf.dev
Regular Expressions for Regular Folk is an experimental book that teaches regular expressions through visual explanations and examples. Its test cases are intended to highlight common gotchas. The book is organized into chapters.
Pricing is not clearly stated.
Key features
- Chapters cover basics, character classes, character escapes, groups, repetition, alternation, flags, anchors, lookaround and advanced examples.
- A single-page version is available for printing.
- Printing instructions mention enabling background graphics in Chrome and Print Background Colors in Firefox.
- The project is open source and welcomes contributions.
- Translations are welcome under the license, and Chinese translations are available as external translations.
Best for: Regex beginners with some programming experience.
Watch out for
- Does not currently cover engine backtracking or recursive regexes.
refrf.dev at a glance
- Official website
- refrf.dev
- Category
- Education & Learning › Learn to Code
- Type
- Publication
- Platforms
- Web
- Details verified
- Oct 22, 2026 · Official source
- Open source
- Yes · Source code
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
Popular in Learn to Code
Well-known listings from the same topic.
Codelabscodelabs.developers.google.comScratchscratch.mit.eduTelegram Bot APIcore.telegram.org/botsStudent Developer Packeducation.github.com/packHacksplaininghacksplaining.comQB64SourceCodeqb64tutorial.com
Is something wrong or out of date?
Tell us and an editor will check it.
Own this website?
Claim this listing
Claim the listing and suggest updates yourself. An editor checks every claim first.