RegEx Tester
RegEx Tester: A focused free tester for common regex flavors, with useful matching and capture controls. Ranked #17 of 23 in Regular Expression Testers by our editors (7.0/10); pricing: Free plan; best for free users testing common programming flavors.
At a glance
- Editor score7.0 / 10
- PricingFree plan
- Best forFree users testing common programming flavors
- Free planYes
- Paid fromFree
- Regex flavors.NET, Node.js, Python, Java
- Facts checked21 Sep 2026
Where it wins
- Supports .NET, Node.js, Python, and Java regex modes
- Includes matching flags, replacement input, and capture groups
- Free, open-source browser-based access
Where it doesn't
- No pattern explanations or step-through debugging
- No code generation for tested patterns
- No saved-pattern workflow
Our verdict on RegEx Tester
RegEx Tester is a browser-based tool for testing regular expressions against user-provided text. It is aimed at developers and other technical users who need to check patterns in .NET, Node.js, Python, or Java modes without paying for access. The interface centers on pattern and test-text fields, with a result view that displays matches and can show capture groups.
Its strongest feature is flavor and matching control in a compact testing workflow. Users can select among the four supported regex modes and adjust options including case, multiline, singleline, and ECMAScript handling. Replacement text input extends the tool beyond simple match checking, while the result view helps inspect what a pattern captures. This makes it suitable for comparing behavior across supported programming environments and refining patterns against sample text.
RegEx Tester keeps its scope narrow. It provides the core inputs, matching controls, replacement support, and results needed for direct pattern testing, but it does not provide explanations, step-through debugging, code generation, or saved patterns. Choose it when free browser access and support for common programming flavors are the priorities. Users who need guided learning, deeper debugging, generated implementation code, or a persistent pattern library should choose a broader regex tool instead.
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RegEx Tester pricing
RegEx Tester fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Regex flavors | .NET, Node.js, Python, Java |
| Pattern explanation | Not verified |
| Step-through debugger | Not verified |
| Code generation | Not verified |
| Saved patterns | Not verified |
| Available platforms | Web |
| Deployment | Cloud |
| Platforms | Web |
| Built for | Solo, Small business (editorial estimate) |
| Pricing | Free plan |
| Website | regextester.github.io |
| Facts checked | 21 Sep 2026 |
Alternatives to RegEx Tester
- regex101A broad regex workbench with debugging, explanations, testing, and code generation.9.4
- RegexStudioDeep regex tooling for developers, learners, and teams who want visual guidance.9.2
- RegexPilotA visual regex workspace with 21 authentic engines and VS Code integration.9.0
See all RegEx Tester alternatives →
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Featured on iTechGuides
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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