regex101
Focus: testing. Shares regex and developer tools with Regexper. Rated 4.8 (Regexper: 4.6).
Web AppFreeWeb
4.8Visit
Web App
Regexper
Turn any regular expression into a clear railroad diagram.
Rating
4.6 / 5
Pricing
Free
Difficulty
Intermediate
Works on
Web
Built with love by Shushant Lakhyani. Building bestproductivityresources.com
What is Regexper?
Regexper takes a JavaScript-style regular expression and draws it as a railroad diagram, so you can see groups, alternatives and repeats at a glance. It is free and open source, runs in the browser and makes regex much easier to explain in docs or reviews.
Pros: what Regexper does well
- Makes regex readable
- Shareable diagram links
- Free and open source
Cons: where it falls short
- Visualises but does not test matches
- JavaScript syntax only
Who Regexper is for
Developers trying to understand or explain a tricky regular expression.
Who can skip it
People who never work with regular expressions.
Regexper alternatives
Not sold on Regexper? These do a similar job, and each card says what it has in common.
RegExr
Focus: testing and patterns. Shares regex and developer tools with Regexper. Rated 4.7 (Regexper: 4.6).
Web AppFreeWeb
4.7Visit
JWT.io
Focus: jwt and authentication. Shares debugging and developer tools with Regexper. Same 4.6 rating.
Web AppFreeWeb
4.6Visit
DevDocs
Focus: documentation, api reference and open source. Shares developer tools with Regexper. Adds Offline. Rated 4.7 (Regexper: 4.6).
Web AppFreeWeb, Offline
4.7Visit
The Missing Semester
Focus: command line, git and mit. Shares developer tools with Regexper. A course, not a web app. Rated 4.8 (Regexper: 4.6).
CourseFreeWeb
4.8Visit
GitHub Student Developer Pack
Focus: students, free credits and education. Shares developer tools with Regexper. A website, not a web app. Rated 4.7 (Regexper: 4.6).
WebsiteFreeWeb
4.7Visit
Free alternatives to Regexper
Want to spend nothing? These free picks cover similar ground.
httpbin
Focus: http and api testing. Shares debugging and developer tools with Regexper. Rated 4.5 (Regexper: 4.6).
Web AppFreeWeb
4.5Visit
Webapp Testing Skill
Focus: claude, claude skills and playwright. Shares debugging and developer tools with Regexper. An AI tool, not a web app. Adds macOS, Windows and Linux. Rated 4.8 (Regexper: 4.6).
AI ToolFreeWeb, macOS
4.8Visit
JSONPlaceholder
Focus: fake api, rest and json. Also in Learning and Workflows, like Regexper. Rated 4.7 (Regexper: 4.6).
Web AppFreeWeb
4.7Visit
CSS Grid Generator
Focus: css grid, layout and front end. Also in Learning and Workflows, like Regexper. Same 4.6 rating.
Web AppFreeWeb
4.6Visit
Layoutit Grid
Focus: css grid, layout and generator. Also in Learning and Workflows, like Regexper. Same 4.6 rating.
Web AppFreeWeb
4.6Visit
Wakamai Fondue
Focus: fonts, opentype and typography. Also in Learning and Workflows, like Regexper. Same 4.6 rating.
Web AppFreeWeb
4.6Visit
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