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regex101

No phone app

8.1No. 1 of 23
in Regular Expression Testers
  • Recognised40% of the score100
  • Phone app26% of the score0
  • Documented20% of the score87
  • Free plan14% of the score100
Free plan
Yes
Paid plans from
€4.99/mo
Runs on
api, Linux, self-hosted, Web
Visit site Alternatives

Summary

regex101 is an online tool for building, testing, and debugging regular expressions. Its editor supports PCRE2, JavaScript, Python, Golang, Java, .NET 10.0, Rust, POSIX ERE, POSIX BRE, and legacy PCRE. Explanations break down how parts of a pattern match according to the chosen flavor, and a step-through debugger helps inspect matching. Results can be exported as JSON, JSON Lines, CSV, or plain text. Developer options include HTTP APIs, an MCP server, editor links, and a separately licensed parser package. The workspace API stores editor data, but it does not offer a remote matching endpoint. File loaders read text, bytes, and supported documents in the browser; saving or sharing workspace input can send it to the workspace service. The free plan includes core regex tools, one test string, and saved workspaces with an account. Pro costs 4.99 EUR per month, billed yearly, and adds multiple test strings, substitution pipelines, benchmarking, formatting, and an ad-free workspace. A self-hosted Enterprise option is also listed.

Who it is for

It suits developers who want to construct and inspect regular expressions across multiple flavors. Teams needing a self-hosted deployment can consider the Enterprise option.

What is good

  • Supports ten listed regular-expression flavors.
  • Explanations are tailored to the selected flavor.
  • Matching can be inspected with a step-through debugger.
  • Results export to four listed formats.
  • Free plan includes saved workspaces with an account.

What to know first

  • Free plan supports one test string.
  • Workspace API does not provide remote matching.
  • Saving or sharing workspace input can send it to the service.

Verdict

regex101 pairs pattern testing with flavor-specific explanations and exports. Review its workspace data handling and the one-test-string free plan before choosing a workflow.

regex101 plans and pricing

All plans
Free Free Core regex tools · one test string · saved workspaces with an account regex101.com · 30 Sept 2026
Pro €4.99/mo billed yearly Multiple test strings · substitution pipelines · advanced benchmarking · regex formatting · ad-free workspace regex101.com · 30 Sept 2026
Enterprise Not published Annual license; invoice-based billing Self-hosted · one running instance per standard license · user count specified on invoice · optional feature add-ons docs.regex101.com · 30 Sept 2026

Compared on regular expression testers

Free plan
Yesregex101.com
Regex flavors
PCRE2 (PHP), JavaScript, Python, Golang, Java, .NET, Rust, POSIX ERE, POSIX BRE, PCRE (Legacy)regex101.com
Pattern explanation
Yesregex101.com
Step-through debugger
Yesregex101.com
Code generation
Yesregex101.com
Saved patterns
Yesregex101.com

Facts

Purpose
regex101 is an online tool for building, testing, and debugging regular expressions.regex101.com · 30 Sept 2026
Explanations
The site explains each part of a regular expression and how it matches, tailored to the selected flavor.regex101.com · 30 Sept 2026
Match exports
Match results can be exported as JSON, JSON Lines, CSV, or plain text.regex101.com · 30 Sept 2026
Developer integrations
Developer integrations include HTTP APIs, an MCP server, editor links, and a separately licensed parser package.docs.regex101.com · 30 Sept 2026
API limitation
The workspace API stores editor data and does not expose a remote matching endpoint.docs.regex101.com · 30 Sept 2026
File privacy
File loaders read text, bytes, and supported documents locally in the browser; saving or sharing the resulting workspace input can send it to the workspace service.docs.regex101.com · 30 Sept 2026
Enterprise data handling
For self-hosted Enterprise, patterns, test strings, workspaces, and files are processed in the customer deployment, which regex101 ApS says it does not access.docs.regex101.com · 30 Sept 2026
Enterprise deployment
The documented standard setup runs on Linux with Docker Compose and uses MySQL and Redis services.docs.regex101.com · 30 Sept 2026
Support
Support includes community discussion, a public issue tracker for reproducible bugs, and email for account, purchase, or private support.docs.regex101.com · 30 Sept 2026
Enterprise support terms
The Enterprise agreement states a reasonable-effort initial response target of five Danish business days and says it is not a guaranteed SLA.docs.regex101.com · 30 Sept 2026
Maker
The maker is regex101 ApS; its terms list an address at Mimers Plads 2, 6. tv, 2220 Copenhagen.docs.regex101.com · 30 Sept 2026

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Sources