public static void DeleteAllChineseFiles()

{

    Regex reg = new Regex("[\\u4e00-\\u9fa5]");

   string[] fileNames = Directory.GetFiles(Application.streamingAssetsPath, "*.*", SearchOption.AllDirectories);

  foreach (string fileName in fileNames)
  {

      if (reg.IsMatch(fileName))
     {
          Debug.LogFormat("fileName is invaild:===={0}", fileName);
         FileUtil.DeleteFileOrDirectory(fileName); 
    }

  }

}