Phone

void main() {
  final phone = '+55 85 88888-8888';
  final replacement = phone.replaceAllMapped(
    RegExp(r'(\d*)\s(\d*)\s(\d*)\-(\d*)'),
    (match) =>
        '${match[1]} ${match[2]} ${match[3]?.replaceAll(RegExp(r'\d'), '*')}-${match[4]}',
  );

  print(phone);
  print(replacement);
}