Exact behavior
- Text fields only.
- Pattern max length 200; subject is capped at 10 000 characters.
- Invalid patterns never match (fail-closed).
- Blank answers never match.
- Patterns may be written with or without delimiters (
^[A-Z]{3}$or/^[A-Z]{3}$/).
Related
- Opposite: Does not match regex
- Simpler text: Contains · Starts with All operators · How logic works