About Regex Tester
Developers spend a surprising amount of time formatting, encoding and decoding small bits of data. Regex Tester is one of those tools you reach for several times a day. Test regular expressions live with highlighted matches and capture groups.
Everything happens in the browser, so you can safely paste secrets, tokens or production payloads without any of it being uploaded to a server. The interface is intentionally minimal — open the page, paste, get the result, move on.
How to use it
- 1Paste your input into the field above.
- 2The output appears instantly — no submit button to click.
- 3Copy the result with the Copy button when you're done.
When it comes in handy
- Debugging API responses during development.
- Pasting sensitive tokens without using a sketchy online tool.
- Quick lookups during code review or pair programming.
- Teaching basics to junior developers with a visible, live result.
Frequently asked questions
Is Regex Tester safe to use with secrets or tokens?
Yes — the entire operation happens in your browser. Nothing is logged or transmitted.
Do I need to install anything?
No. Open the page in any modern browser and it works instantly.
Can I bookmark this tool?
Yes. The page has its own clean URL you can save and reuse.