public static @NotNull Predicate<Path> regularFileFilter() {
    return file -> {
      try {
        if (Files.isDirectory(file) || Files.isHidden(file)) {
          return false;
        }
      }
      catch (IOException e) {
        return false;
      }

      String fileName = file.getFileName().toString();
      int index = fileName.lastIndexOf('.');
      return index >= 0 && !fileName.endsWith(".txt") && !fileName.endsWith(".properties") &&
             !fileName.regionMatches(index + 1, BACKUP_FILE_EXTENSION, 0, BACKUP_FILE_EXTENSION.length());
    };
  }
public static @NotNull Predicate<Path> regularFileFilter()