regex101
Focus: debugging. Shares regex and developer tools with RegExr. Rated 4.8 (RegExr: 4.7).
Web AppFreeWeb
4.8Visit
Web App
RegExr
Learn, build and test regular expressions with live feedback.
Built with love by Shushant Lakhyani. Building bestproductivityresources.com
What is RegExr?
RegExr highlights matches as you type a regular expression, explains each part of the pattern and includes a cheat sheet and community patterns. It is free and open source, supports JavaScript and PCRE flavours, and lets you save and share patterns.
Pros
- Plain-English pattern explanations
- Live match highlighting
- Built-in cheat sheet
Cons
- Fewer regex flavours than some tools
- Saving needs an account
Who should use RegExr
Developers and learners who want to understand and debug regular expressions.
Who may not need it
People who never work with text patterns.
RegExr alternatives
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DevDocs
Focus: documentation, api reference and open source. Shares developer tools with RegExr. Adds Offline. Same 4.7 rating.
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Collect UI
Focus: ui inspiration, design gallery and components. Shares patterns with RegExr. A website, not a web app. Rated 4.4 (RegExr: 4.7).
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Webapp Testing Skill
Focus: claude, claude skills and playwright. Shares testing and developer tools with RegExr. An AI tool, not a web app. Adds macOS, Windows and Linux. Rated 4.8 (RegExr: 4.7).
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Focus: AI, Automation and Documentation. Also in Workflows and Learning, like RegExr. Freemium (RegExr: Free). Adds Chrome, Windows and macOS. Same 4.7 rating.
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Free alternatives to RegExr
Free resources that cover similar ground.
Emulate
Focus: api emulation, ci and open source. Shares testing and developer tools with RegExr. A framework, not a web app. Rated 4.4 (RegExr: 4.7).
FrameworkFreeCross-Platform
4.4Visit
Shoogle
Focus: shadcn, ui components and search. Also in Workflows and Learning, like RegExr. Rated 4.4 (RegExr: 4.7).
Web AppFreeWeb
4.4Visit
The Art of Command Line
Focus: command line, terminal and bash. Also in Learning and Workflows, like RegExr. A course, not a web app. Adds macOS, Linux and Windows. Rated 4.9 (RegExr: 4.7).
CourseFreeWeb, macOS
4.9Visit
Agentic Design Patterns
Focus: ai agents, design patterns and llm. Also in Learning and Workflows, like RegExr. A book, not a web app. Adds Offline. Rated 4.8 (RegExr: 4.7).
BookFreeOffline, Web
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AI Agents for Beginners
Focus: ai agents, microsoft and course. Also in Learning and Workflows, like RegExr. A course, not a web app. Rated 4.8 (RegExr: 4.7).
CourseFreeWeb
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CyberChef
Focus: data conversion, encoding and open source. Shares developer tools with RegExr. Adds Offline. Rated 4.8 (RegExr: 4.7).
Web AppFreeWeb, Offline
4.8Visit
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