Purpose
Test patterns, flags, matches, and match indexes.
How it works
A pattern describes text structure while flags control global, case-insensitive, and multiline behavior; results follow JavaScript RegExp semantics.
Input
Enter text, numbers, a file, or a query target as required. Start with the page example to confirm the format, then replace it with your data.
Interpreting output
Confirm output format, units, and status, then compare with the input and target environment; successful formatting does not prove validity.
Limitations and privacy
This tool processes input locally in the browser and does not send it to the server.