RegExr
RegExr: A free, open-source web regex workspace with helpful explanations and testing tools. Ranked #10 of 23 in Regular Expression Testers by our editors (6.5/10); pricing: Free plan; best for open-source users wanting community regex tools.
At a glance
- Editor score6.5 / 10
- PricingFree plan
- Best forOpen-source users wanting community regex tools
- Free planYes
- Paid fromNone
- Regex flavorsJavaScript, PHP/PCRE
- Facts checked21 Sep 2026
Where it wins
- Supports JavaScript and PHP/PCRE expressions with real-time updates
- Includes explanations, reference examples, and detailed match inspection
- Offers test suites, saving, sharing, replacements, and community patterns
Where it doesn't
- Regex flavor coverage is limited to JavaScript and PHP/PCRE
- Available as a web tool rather than a broader platform offering
- Debugging support is focused on explanations and inspection tools
Our verdict on RegExr
RegExr is a browser-based regular-expression tool for developers and learners who need to build, test, understand, and share patterns. Its free web access combines JavaScript and PHP/PCRE support with real-time result updates, pattern and match details, test suites, and a reference containing help and examples. Open-source users may also value its GPL v3 source code and community pattern search with ratings.
Its strongest area is the connection between testing and learning. Plain-language pattern explanations, the Explain tool, and detailed match information help users inspect how an expression behaves rather than relying only on a pass-or-fail result. Replace and List tools extend the workspace beyond basic matching, while test suites provide a way to validate patterns against multiple cases. Saving and sharing expressions makes the tool suitable for documenting examples or collaborating around specific patterns.
RegExr is most suitable for web-based work involving JavaScript or PHP/PCRE, especially when explanation and reference material matter as much as pattern matching. Its scope is narrower for users working across other regex flavors or looking for broader debugging coverage. Those users should choose a tool with wider flavor support or more specialized diagnostics. For learners, developers, and open-source users who want community patterns alongside practical testing utilities, RegExr offers a focused and accessible workspace without requiring a paid tier.
RegExr pricing
RegExr fact sheet
| Free plan | Yes |
|---|---|
| Paid from | None |
| Regex flavors | JavaScript, PHP/PCRE |
| Pattern explanation | Yes |
| Step-through debugger | Not verified |
| Code generation | Not verified |
| Saved patterns | Yes |
| Available platforms | Web |
| Deployment | Cloud |
| Platforms | Web |
| Support | Community, Docs |
| Built for | Solo, Small business (editorial estimate) |
| Pricing | Free plan |
| Website | regexr.com |
| Facts checked | 21 Sep 2026 |
Alternatives to RegExr
- regex101A broad regex workbench with debugging, explanations, testing, and code generation.9.8
- RegexPilotA visual regex workspace with 21 authentic engines and VS Code integration.8.5
- RegexStudioDeep regex tooling for developers, learners, and teams who want visual guidance.8.2
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Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026
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