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RegexPlanet

regexplanet.com

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Spec score 7.5 #11 of 23 in Regular Expression Testers

What it is

RegexPlanet is a free web service for testing regular expressions during development. It offers separate test pages for engines including Java, Python, Bun, Go, Deno, Erlang, Haskell, MySQL, .NET, Node.js, Perl, PHP, PostgreSQL, Ruby, Rust, Swift, Tcl, XRegExp, and the browser. The Java tester accepts a pattern, replacement, and multiple input strings, with a control for adding more inputs. Options include case-insensitive matching, multiline mode, and Unicode-aware case folding. The home page provides a field for share codes, and the site directs users to Regex Zone for sharing expressions and finding patterns. A status page reports engine status and says each engine runs separately. RegexPlanet warns that malformed expressions may run indefinitely and that some engines or hosts may face denial-of-service attacks. Its privacy policy describes collection of IP addresses, browser data, and form entries; raw logs are stored by Google CloudRun. The service is offered as-is and as-available.

Spec sheet

Purpose
RegexPlanet is a website for testing regular expressions during development.Read 8 Oct 2026 · regexplanet.com
Support
The site provides a contact form for questions and inquiries.Read 8 Oct 2026 · regexplanet.com
Data storage
The privacy policy says the maker does not store data locally and that raw log files are stored by its cloud provider, currently Google CloudRun.Read 8 Oct 2026 · regexplanet.com
Engine options
The Java tester exposes engine options such as case-insensitive matching, multiline mode, and Unicode-aware case folding.Read 8 Oct 2026 · regexplanet.com
Engine status
A status page reports the status of each engine and says each engine runs in a separate instance.Read 8 Oct 2026 · regexplanet.com
Open source repository
The maker's GitHub repository describes a next-generation version and lists the GNU Affero General Public License v3.0 or later.Read 8 Oct 2026 · github.com
Privacy data
The privacy policy says the site collects IP addresses, user agents, other browser-sent data, and anything entered into forms.Read 8 Oct 2026 · regexplanet.com
Regex community
The site directs users to Regex Zone to share regular expressions and find common patterns.Read 8 Oct 2026 · regexplanet.com
Regex engines
The site provides regex test pages for engines including Java, Python, Bun, and Go.Read 8 Oct 2026 · regexplanet.com
Security limitation
The maker warns that badly formed regular expressions can run indefinitely and that some engines or hosts may be susceptible to denial-of-service attacks.Read 8 Oct 2026 · regexplanet.com
Share codes
The home page describes share codes as a way to share regexes and provides a field for entering one.Read 8 Oct 2026 · regexplanet.com
Terms and availability
The terms describe the service as provided as-is and as-available, without a warranty that it will be available, uninterrupted, secure, or error-free.Read 8 Oct 2026 · regexplanet.com
Test inputs
The Java tester has fields for a regular expression, replacement, and multiple input strings, with a control to add more inputs.Read 8 Oct 2026 · regexplanet.com

Plans and prices

Free public service Free Website for testing regular expressions · provided free to the public Read 8 Oct 2026 · regexplanet.com

Every RegexPlanet plan and price →

Strong points and limits

Strong points

  • Supports many regex engine flavors
  • Java tester accepts multiple input strings
  • Provides matching and Unicode options
  • Share-code field supports regex sharing
  • Free public web service

Limits

  • Malformed expressions may run indefinitely
  • Some engines or hosts may face denial-of-service attacks
  • Collects IP addresses and form entries
  • Service availability is not warranted

Who it suits

RegexPlanet suits developers who need browser-based testing across many regex engines. It also fits users who want share codes or community pattern references.

Verdict

RegexPlanet provides broad engine coverage and useful Java testing controls at no cost. Its warnings about unbounded expressions, data collection, and availability should shape how you use it.

Where Specifiction places it

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