Regex Tester
Test regular expressions with live match highlighting and groups.
Runs on your device · no upload
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About Regex Tester
Regex Tester runs your regular expression against sample text and highlights every match, listing capture groups and positions as you type.
1
Paste your input
Everything runs in your browser. Nothing is sent anywhere.
2
Get the result
Copy it with one tap.
3
Download
Save the result. No watermark, no sign-up.
Frequently asked questions
Which regex flavour is used?
JavaScript (ECMAScript) regular expressions.
Can I see capture groups?
Yes. Each match lists its numbered groups.
Are my files uploaded anywhere?
No. This tool runs in your browser, so your file stays on your device and is never sent to a server.