How to use the Regex Tester
- Type your regular expression and flags.
- Paste the text you want to test.
- Matches are highlighted live, with positions and capture groups listed below.
Private by design
Developer data is often sensitive: API responses, tokens, customer records, internal configs. This Regex Tester processes everything locally in your browser tab. There is no server round-trip, no logging and no storage of your input. Prefer a native app? Read about Regex Tester in DevT Pro.
Frequently asked questions
Is this Regex Tester free?
Yes. This Regex Tester is completely free to use with no sign-up, no limits and no ads inside the tool.
Is my data uploaded to a server?
No. The Regex Tester runs entirely in your browser using JavaScript. Nothing you paste is sent to DevT Pro or any other server.
Can I use the Regex Tester offline?
Yes. Regex Tester is also built into DevT Pro, a native app for Mac, Windows, iPad and Linux with 120+ developer tools that work fully offline. It is a $5.99 one-time purchase with no subscription.
