code: public static void deleteFilesWithFilenameFilter(final File source,
  		final FilenameFilter includeFilenameFilter)
  		throws FileIsNotADirectoryException, IOException, FileIsSecurityRestrictedException
  	{
  		DeleteFileExtensions.deleteFilesWithFilenameFilter(source, includeFilenameFilter, null);
  	}
docs: Tries to delete all files that match to the given includeFilenameFilter from the given source
  directory.
  
  @param source
  The source directory.
  @param includeFilenameFilter
  The FilenameFilter for the files to be deleted. If null all files will be deleted.
  
  @throws FileIsNotADirectoryException
  Is thrown if the destination file is a directory.
  @throws IOException
  Is thrown if an error occurs by reading or writing.
  @throws FileIsSecurityRestrictedException
  Is thrown if the source file is security restricted.