Flutter/Dart - Regex that Checks if password has at least uppercaseCount uppercase letter matches

DartGist3.dart

//Checks if password has at least uppercaseCount uppercase letter matches
bool hasMinUppercase(String password, int uppercaseCount) {
  String pattern = '^(.*?[A-Z]){' + uppercaseCount.toString() + ',}';
  return password.contains(new RegExp(pattern));
}