RegexPlanet
RegexPlanet: A free web tester for comparing regex behavior across many engines. Ranked #12 of 23 in Regular Expression Testers by our editors (6.1/10); pricing: Free plan; best for users testing many engines for free.
At a glance
- Editor score6.1 / 10
- PricingFree plan
- Best forUsers testing many engines for free
- Free planYes
- Paid fromNone
- Regex flavorsYour Browser, Bun, Deno, Erlang, Go, Haskell, Java, MySQL, .NET, Node.js, Perl, PHP, PostgreSQL, Python, Ruby, Rust, Swift, Tcl, XRegExp
- Facts checked21 Sep 2026
Where it wins
- Supports 19 regex flavors, including Java, Python, .NET and Rust
- Tests multiple input strings with replacement text, flags and engine options
- Provides share codes, engine status information and documentation links
Where it doesn't
- Web-only access may not suit local or offline workflows
- No pattern explanations, step-through debugging or code generation
- No persistent saved projects for organizing regex work
Our verdict on RegexPlanet
RegexPlanet is a free, browser-based service for testing regular expressions during development. It is suited to developers who need to compare behavior across language and runtime engines, including JavaScript-based engines, Java, Python, Go, PHP, Ruby, Rust, Swift and others. Users can enter a pattern, replacement text and one or more input strings, then run matches with engine-specific options and flags.
Its main strength is breadth across regex flavors. RegexPlanet supports 19 options, including Your Browser, Bun, Deno, Erlang, Go, Haskell, Java, MySQL, .NET, Node.js, Perl, PHP, PostgreSQL, Python, Ruby, Rust, Swift, Tcl and XRegExp. Separate testing pages help users switch between engines, while engine status information and links to official documentation add useful context when syntax or behavior differs. Share codes also make it practical to pass a regex setup to another person.
The trade-off is a focused testing workflow rather than a complete regex development environment. RegexPlanet does not provide pattern explanations, step-through debugging or code generation, and it does not offer persistent saved projects. That makes it a strong choice for quick browser-based comparisons, replacement checks and engine-specific validation, especially when avoiding paid tooling matters. Users who need guided debugging, generated implementation code or ongoing project organization should choose a more feature-rich alternative.
RegexPlanet pricing
RegexPlanet fact sheet
| Free plan | Yes |
|---|---|
| Paid from | None |
| Regex flavors | Your Browser, Bun, Deno, Erlang, Go, Haskell, Java, MySQL, .NET, Node.js, Perl, PHP, PostgreSQL, Python, Ruby, Rust, Swift, Tcl, XRegExp |
| Pattern explanation | Not verified |
| Step-through debugger | Not verified |
| Code generation | Not verified |
| Saved patterns | Not verified |
| Available platforms | Web |
| Deployment | Cloud |
| Platforms | Web |
| Support | Docs |
| Built for | Solo, Small business (editorial estimate) |
| Pricing | Free plan |
| Website | regexplanet.com |
| Facts checked | 21 Sep 2026 |
Alternatives to RegexPlanet
- 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
See all RegexPlanet alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026
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