LyNullableStringIsAlpha constructor

LyNullableStringIsAlpha(
  1. String message
)

Validation that requires a string to contain only letters (a-zA-Z).

If the value contains anything other than letters, the message is returned.

Example:

final validator = LyNullableStringIsAlpha('Invalid alpha');
final result = validation('abc123');
print(result); // Invalid alpha

Implementation

LyNullableStringIsAlpha(super.message);