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 with live match highlighting in your browser. Free private regex tester — no upload.

Developer

Runs entirely in your browser — files stay on your device. No upload required.

Matches update as you type

Index and capture groups

1. [0] "korisa"
2. [28] "tool"
3. [50] "tool"

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

Runs entirely in your browser so private test data never leaves your device.