isValidPhone static method

String? isValidPhone(
  1. String? phoneNo
)

Implementation

static String? isValidPhone(String? phoneNo) {
  if (phoneNo == null || phoneNo.isEmpty) {
    return 'Please enter a valid phone number.';
  }
  final regExp = RegExp(
    r'^[\+]?[(]?[0-9]{3}[)]?[-\s\.]?[0-9]{3}[-\s\.]?[0-9]{4,6}$',
  );
  if (!regExp.hasMatch(phoneNo)) {
    return 'Please enter a valid phone number';
  }
  return null;
}