validatePhoneNumber function

String? validatePhoneNumber(
  1. BuildContext context,
  2. String? value
)

Implementation

String? validatePhoneNumber(BuildContext context,  String? value) {
  if (value == null || value.isEmpty) {
    return S.of(context).please_enter_a_phone_number;
  }
  Pattern pattern = r'^\d{3,20}$';
  RegExp regex = RegExp(pattern as String);
  if (!regex.hasMatch(value)) {
    return S.of(context).please_enter_a_valid_phone_number;
  }
  return null;
}