validate method

@override String? validate(String? value)

Validates the given value and returns an error message if the value is invalid.

Implementation

@override
String? validate(String? value) {
  if (value == null) return null;
  if (value.trim().length == length) {
    return getErrorMessage(
      EasyValidatorMessages.instance.notEqualLength,
      length.toString(),
    );
  }
  return null;
}