isbn13MaybeRegStr top-level property

String isbn13MaybeRegStr

getter/setter pair

The pattern used to match exactly 13 numeric digits.

This pattern ensures that the string is composed strictly of 13 digits from start (^) to end ($), using a non-capturing group.

Pattern: ^(?:[0-9]{13})$

Implementation

String isbn13MaybeRegStr = r'^(?:[0-9]{13})$';