Regular Expression Tester
Test and validate regular expressions with real-time matching and replacement
Common Patterns
Results
No matches found. Enter a pattern and test string, then click "Test".
DebugTools product
Regex Tester
Regex Tester is a focused DebugTools mini-product for developers. Test regular expressions with live matches.
Use cases
- Handle everyday formatting, conversion, generation, and inspection tasks.
- Keep sensitive snippets in the browser for quick local work.
- Prepare clean output for tests, docs, API calls, and debugging sessions.
How it works
- Paste or load the snippet you want to inspect in Regex Tester.
- Run the tool in the browser and review the highlighted output.
- Copy, export, or turn the result into the next debugging step.
Privacy
- Regex Tester is local-first. The core workflow runs in your browser and does not require sending pasted content to DebugTools servers.
This tool history
Recent Regex Tester sessions
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