What does Regex Tester do?
It lets you test regular expressions against sample text and see matches update in real time as you type the pattern.
Common uses
- Checking that a pattern matches what you expect before using it in code
- Debugging tricky expressions step by step
- Learning regex by experimenting with live feedback
Key features
- Real-time matching — matches highlight as you type
- Flags support — use flags like global, case-insensitive, and multiline
- Replace mode — test find-and-replace logic
How it works
You enter a pattern and sample text; the tool highlights every match as you type. Everything runs locally in your browser.
What are flags?
Flags change how a regex behaves: `g` matches globally, `i` ignores case, `m` changes `^`/`$` to line anchors, and more. Testing with the right flags ensures accurate results.
Verdict
Regex Tester is a dependable live playground for building and debugging patterns. Open Regex Tester and test your regex — free and private.