Does it support flags like g and i?

Yes. Use common flags for global and case-insensitive matching.

Is my test data uploaded?

No. Regex testing stays in your browser.

Yes. Test regular expressions online free.

Test regular expressions online with live match highlighting. Free regex tester for JavaScript-style patterns.

Developer

Runs entirely in your browser — files stay on your device.

Matches update as you type

Index and capture groups

1. [0] "Korisa"
2. [24] "tool"
3. [46] "tool"

Write a pattern, paste sample text, and see matches update live. Debug capture groups before shipping validation logic.

Runs entirely in your browser for private test data.

Does it support flags like g and i?: Yes. Use common flags for global and case-insensitive matching.
Is my test data uploaded?: No. Regex testing stays in your browser.
Is Regex Tester free?: Yes. Test regular expressions online free.