How to use Online Regular Expression Tester
- Drop your text into the field at the top of Online Regular Expression Tester.
- Adjust the Pattern, Flags options to match what you need.
- Watch the output update instantly while you adjust the text.
- Finish by choosing Copy matches to take the output with you.
About this tool
Everything Online Regular Expression Tester does happens on your own device. Online Regular Expression Tester tests your regular expression against sample text in your browser, highlighting matches as you type.
Your pattern and test text stay on your device. No data is sent anywhere, so it stays fast and private by default.
Frequently asked questions
How do I use Online Regular Expression Tester?
Online Regular Expression Tester lets you check your input right in the browser using the Pattern, Flags controls, with the result shown instantly and nothing uploaded.
Is Online Regular Expression Tester free to use?
Yes — Online Regular Expression Tester is completely free, with no usage limits.
Does Online Regular Expression Tester upload my data?
No — Online Regular Expression Tester processes everything locally in your browser, so nothing you enter is uploaded or stored.
Which regex flavor does Online Regular Expression Tester use?
Online Regular Expression Tester runs your pattern with the browser's own JavaScript regex engine, live and on your device.
Does Online Regular Expression Tester work offline?
Once the page has loaded, Online Regular Expression Tester keeps working with no network connection.