Developer

Regex Tester

Test JavaScript regular expressions with live highlighting. Free, no sign-up, and it runs in your browser — your files are never uploaded.

How to use

1. Enter a pattern and flags
2. Paste a test string — matches highlight live
3. Optionally test a replacement

Questions

Do I need an account?

No. Every tool is free to use without signing up.

Is my data uploaded?

No. This tool runs in your browser, so the text and files you use stay on your device.

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