Regex Tester
Write JavaScript regular expressions and see matches, groups and replacements live.
Files never leave your device Instant results 100% free No sign-up
How to use the Regex Tester
- Paste your input or type directly in the editor.
- Pick the operation — results appear in real time.
- Copy the output to your clipboard or download it.
Private & secure
Processing happens locally with JavaScript, Canvas and Web APIs.
No uploads, no storage, no account. Close the tab and it is gone.
Works on desktop and mobile in any modern browser.