validate method

  1. @override
ValidationException? validate(
  1. Object? value
)
override

Return null if valid, otherwise a ValidationException.

Implementation

@override
ValidationException? validate(Object? value) {
  if (value is String) {
    if (value.contains(RegExp(r'\s'))) {
      return ValidationException(this, value);
    }
  }
  return null;
}