regex101
regex101: A broad regex workbench with debugging, explanations, testing, and code generation. Ranked #1 of 23 in Regular Expression Testers by our editors (9.8/10); pricing: Free plan · 7-day trial; best for teams needing a full-featured regex workbench.
At a glance
- Editor score9.8 / 10
- PricingFree plan · 7-day trial
- Best forTeams needing a full-featured regex workbench
- Free planYes
- Regex flavorsPCRE2 (PHP), JavaScript, Python, Golang, Java, .NET, Rust, POSIX ERE, POSIX BRE, PCRE (Legacy)
- Facts checked21 Sep 2026
Where it wins
- Supports multiple regex engine flavors and POSIX variants
- Combines explanations, debugging, code generation, and unit tests
- Offers saved workspaces, exports, benchmarking, API, and MCP access
Where it doesn't
- Pro features require a paid plan
- Enterprise deployment and support are reserved for Enterprise
- The broad feature set may exceed the needs of simple regex checks
Our verdict on regex101
regex101 is a browser-based regular-expression editor for developers and technical users who need more than basic pattern matching. It supports matching, substitution, extraction, unit tests, pattern explanations, code generation, benchmarking, and debugging. Users can work with PCRE2, JavaScript, Python, Golang, Java, .NET, Rust, POSIX ERE, POSIX BRE, and legacy PCRE. Accounts add saved workspaces with titles, tags, favorites, and privacy controls, making the product suitable for individual developers and teams maintaining reusable patterns.
The product’s main strength is breadth within the regex workflow. Its PCRE2 execution debugger helps inspect pattern behavior, while automatic explanations, code generation, and unit tests support understanding and reuse. Match results can be exported to JSON, JSON Lines, CSV, or plain text. Multiple test strings, substitution pipelines, advanced benchmarking, Format Regex, and an ad-free workspace are listed under Pro. API and MCP integrations extend access beyond the primary web interface, while the web and self-hosted options support different deployment preferences.
The Free plan includes the core regex editor, syntax highlighting and explanation, unit tests, saved workspaces, and Community Library access. Pro adds the listed testing, substitution, formatting, benchmarking, and workspace features. Enterprise focuses on private self-hosted and air-gapped deployment, data remaining within the customer’s infrastructure, custom OAuth single sign-on, and email support. A seven-day free trial is available. Teams that need multiple engines, debugging, documentation, code generation, and reusable workspaces should consider regex101; users seeking only a lightweight pattern checker may prefer a narrower tool.
regex101 pricing
All 3 regex101 plans and prices →
regex101 fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Not verified |
| Regex flavors | PCRE2 (PHP), JavaScript, Python, Golang, Java, .NET, Rust, POSIX ERE, POSIX BRE, PCRE (Legacy) |
| Pattern explanation | Yes |
| Step-through debugger | Yes |
| Code generation | Yes |
| Saved patterns | Yes |
| Available platforms | Not verified |
| Free trial | 7 days |
| Deployment | Cloud, Self-hosted |
| Platforms | Web |
| Support | Email, Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 2 integrations: API, MCP |
| Pricing | Free plan · 7-day trial (source) |
| Website | regex101.com |
| Facts checked | 21 Sep 2026 |
regex101 integrations
regex101 lists 2 integrations on its own site.
- API
- MCP
Alternatives to regex101
- 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
- RegexCraftA feature-rich desktop regex workbench with free personal use and a $49 business license.8.2
See all regex101 alternatives →
regex101 vs the competition
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Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026
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