🔍 Regex Tester
Test and debug regular expressions with real-time matching — free, in your browser.
🔍 Regex Pattern
📝 Test String
📊 Results
Highlighted Matches:
Regex Tester: Test regular expressions live
Regex Tester lets you test regular expressions live. Upload a regex pattern and get match results — all processed locally in your browser, with no uploads and no sign-up.
Debug regex patterns
Debug regex patterns. This is one of the most common reasons people reach for Regex Tester — and it handles the job in seconds, entirely in your browser.
Test matches against sample text
Test matches against sample text. This is one of the most common reasons people reach for Regex Tester — and it handles the job in seconds, entirely in your browser.
Learn regex with live feedback
Learn regex with live feedback. This is one of the most common reasons people reach for Regex Tester — and it handles the job in seconds, entirely in your browser.
Everything You Need in a Regex Tester
Powerful features that make Regex Tester fast, private, and free.
Instant Processing
Conversion and validation happen as you type.
Developer-Grade
Built for accurate, standards-compliant results.
100% Private
All processing is local — no data is sent anywhere.
Copy & Export
One-click copy to clipboard for quick use.
Free Forever
No sign-up, no API keys, no limits.
Regex & JSON Support
Full regular expression and JSON validation built in.
How to Use
Enter Pattern
Type your regex pattern in the Pattern field.
Set Flags
Check flags like g, i, m, s as needed.
Enter Test Text
Paste or type text to test against.
View Results
Matches are highlighted and listed with details.
Detailed User Guide
Enter Pattern
Type your regex pattern in the Pattern field.
Set Flags
Check flags like g, i, m, s as needed.
Enter Test Text
Paste or type text to test against.
View Results
Matches are highlighted and listed with details.