In DiredMode, ‘Q’ will query-replace-regexp on each filesname marked. As with query-replace-regexp, a prefix arg will limit the search to whole words. To mark files, there are a number of options including: use the ‘m’ key to mark individual files`% m’ to mark all filenames matching a regexp`% g’ to mark all files containing a regexp`% m RET’ (empty regexp) to mark all files. If there are no files