docs: public static ClientSelector nameSelector(final String nameMask) {
          return new ClientSelector() {
              @Override
              public boolean select(Client client) {
                  String name = client.getName();
                  if (name == null) {
                      return false;
                  }
                  return name.matches(nameMask);
              }
  
              @Override
              public String toString() {
                  return "ClientSelector{nameMask:" + nameMask + " }";
              }
          };
      }