void main() {
  final regex = RegExp(r'^/packs/\d+/tests');
  print('Regex matches /packs/10/tests: ${regex.hasMatch('/packs/10/tests')}');
  print('Regex matches /packs/123/tests: ${regex.hasMatch('/packs/123/tests')}');
  print('Regex matches /packs/10/cards: ${regex.hasMatch('/packs/10/cards')}');
}