Skip to content
OpenToolVault

Regex101

Interactive regex tester with explanation, debugger, and code generation. Supports PCRE2, Python, Go, JavaScript.

Not yet verified
Demo online
MIT★ 5000

Open the official app on regex101.com

This tool is hosted by its maintainers. Click below to open regex101.com in a new tab — it's their official demo.

Launch tool View source
Browse text & tools tools →

What's next with Regex101?

Choose how you want to get started.

Use it free

Open the official tool or demo — no account needed.

Free

Self-host it

Run the open-source version on your own infrastructure.

Open

What is Regex101?

Regex101 is Interactive regex tester with explanation, debugger, and code generation. Supports PCRE2, Python, Go, JavaScript. Source: https://github.com/regex101. License: MIT.

How it works

Regex101 works by processing your input directly. Interactive regex tester with explanation, debugger, and code generation. Supports PCRE2, Python, Go, JavaScript.

How to use it

  1. 1Open the Regex101 tool, enter your input, and get your result instantly.

What it can do

  • Utility

Use cases

Assumptions and limitations

Assumptions

  • source: https://github.com/regex101
  • license: MIT — free to use
  • privacy: Opens an external demo

Limitations

  • External demo — opens a third-party website that you do not control.
  • Relies on an external source (github.com); availability depends on that service.
  • Focused on the text tools category: Interactive regex tester with explanation, debugger, and code generation. Supports PCRE2, Python, Go, JavaScript..

Understanding the result

Interactive regex tester with explanation, debugger, and code generation. Supports PCRE2, Python, Go, JavaScript.

Tool details

  • Clearly flagged when a network request is needed.
  • No account, no sign-up, and no tracking of your content.
  • Powered by regex101 (MIT).
Built with
regex101 (https://github.com/regex101)
License
MIT
Runs locally
No — requires a network request
Verification
Not yet verified
Input
Code
Output
Output
Open-source source & license

Built with https://github.com/regex101. OpenToolVault provides the discovery and browser interface while crediting the original project maintainers.

Built with
regex101
License
MIT
View source on GitHub

Open-source project

License: MITSource: this projectOfficial site

OpenToolVault is an independent directory. We are not affiliated with or endorsed by this project.

References

Frequently asked

What is Regex101?

Interactive regex tester with explanation, debugger, and code generation. Supports PCRE2, Python, Go, JavaScript.

Where can I find the source code?

The source is available at https://github.com/regex101

What license is it?

MIT.

Is it free to use?

Yes, it is open-source and free to use.

Spotted something wrong with Regex101, or want to maintain it? See how to help.