Regex Tester
Test JavaScript RegExp locally. No backend.
About this Regex tool
JavaScript RegExp - local testing
Test and debug JavaScript regular expressions directly in your browser.
The tool supports match, replace and split modes with real-time highlighting and group inspection.
Everything runs locally without sending text or patterns to a server.
- Test match, replace and split operations
- Live highlighting and capture groups
- Performance stats and execution time
- Everything runs locally - no uploads
Settings
pattern, flags and modes
ready
Pattern
Flags
Mode
Replacement
Split limit
Options
Text
Output
compiled: -
matches: 0
time: 0 ms
-
Ctrl+Enter - run
Notes
JS RegExp
This tester is for JavaScript RegExp (not PCRE/Java).
FAQ
Common questions
Does this support PCRE or Java regex?
No. This tester is for JavaScript RegExp only.
Is my text sent to a server?
No. All processing happens locally in your browser.
Can I test large texts?
Yes, but very large inputs may affect browser performance.
Does this tool work offline?
Yes. After the first load, it can be used offline.
About
Service Overview
Regex tester online - test, debug and validate patterns with live matches.
Related tools
You may also find these tools useful