Regular Expression Tester
Test a JavaScript regular expression with bounded processing and a match report.
On-device processingOriginals stay unchangedNo account required
1. Add your text
2. Choose your options
3. Review & download
Your result will appear here after processing.
Practical example
Pattern \d+ with flags g finds 123 and 45 in Invoice 123 total 45.
Limits · supported files
Pattern up to 500 characters, text up to 50,000 characters, at most 1,000 matches. Worker processing stops after 500 ms; expensive expressions may fail. JavaScript syntax only, not other language engines.
Step-by-step guide
How to use Regular Expression TesterReview the example, result checks and limitations before using your own inputs.