How to use Regex Tester for Java
- Type or paste your pattern and test string into Regex Tester for Java's input area.
- Adjust the Pattern, Flags options to match what you need.
- Regex Tester for Java updates the output automatically as you type.
- Finish by choosing Copy matches to take the output with you.
About this tool
Everything Regex Tester for Java does happens on your own device. Regex Tester for Java tests your regular expression against sample text in your browser, highlighting matches as you type.
Flags and group captures are surfaced so you can refine the pattern quickly. No data is sent anywhere, so it stays fast and private by default.
Frequently asked questions
What is Regex Tester for Java for?
Use Regex Tester for Java to check your input without installing anything using the Pattern, Flags controls; everything happens client-side.
Is Regex Tester for Java free to use?
Yes — Regex Tester for Java is completely free, with no usage limits.
Is my input private in Regex Tester for Java?
Yes — your input never leaves your device; Regex Tester for Java does all the work in your browser.
Which regex flavor does Regex Tester for Java use?
Regex Tester for Java runs your pattern with the browser's own JavaScript regex engine, live and on your device.
Does Regex Tester for Java work on mobile?
Yes — Regex Tester for Java is just a web page and runs on any modern browser, including phones and tablets.