validateCity function

String validateCity(
  1. String city
)

Implementation

String validateCity(String city) {
  if (city.trim().isEmpty) {
    return 'City is required';
  }

  final invalidCharsRegex = RegExp(r'[^a-zA-Z\s]+');
  if (invalidCharsRegex.hasMatch(city)) {
    return 'Please enter a valid City (letters and spaces only)';
  }

  return '';
}