passportValidator static method

String? passportValidator(
  1. String? value, [
  2. String? errorMessage
])

passportValidator to validate a passport number

validator: (value) => SimpleValidations.passportValidator(value, [errorMessage]),

Implementation

static String? passportValidator(String? value, [String? errorMessage]) {
  RegExp regex = CustomRegEx.passportRegex;

  if (value == null || value.isEmpty) {
    return errorMessage ?? 'Required';
  } else if (!regex.hasMatch(value)) {
    return errorMessage ?? 'Please enter a valid passport number';
  }

  return null;
}