How to use Regex Online
- Type or paste your pattern and test string into Regex Online's input area.
- Use the Pattern, Flags settings to control the result.
- The result is computed live in your browser as you edit the input.
- Use Copy matches to keep or reuse the result.
About this tool
There is no server behind Regex Online. Regex Online runs your pattern locally with the JavaScript engine and shows captures live.
Your pattern and test text stay on your device. It behaves the same on desktop and mobile, with nothing stored remotely.
Frequently asked questions
What does Regex Online do?
Regex Online runs entirely on your device: add your input using the Pattern, Flags controls, and it processes it locally in real time.
Is Regex Online free to use?
Yes — Regex Online is completely free, with no usage limits.
Where is my data processed by Regex Online?
Entirely in your browser — Regex Online keeps your data on your own machine and sends nothing anywhere.
Which regex flavor does Regex Online use?
Regex Online runs your pattern with the browser's own JavaScript regex engine, live and on your device.
Does Regex Online work on mobile?
Yes — Regex Online is just a web page and runs on any modern browser, including phones and tablets.