isValidPairingCodeFormat property Null safety
Valid pairing code contains uppercase letters and digits, with a length of 6
Implementation
bool get isValidPairingCodeFormat {
// Regex taken from:
// https://stackoverflow.com/questions/49757486/how-to-use-regex-in-dart
final nameRegExp = RegExp(r'^[A-Z0-9]+$');
return nameRegExp.hasMatch(this) && length==6;
}