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5.37 How do I perform a replace operation across more than one file?

Dired mode (M-x dired RET, or C-x d) supports the command dired-do-query-replace-regexp (Q), which allows users to replace regular expressions in multiple files.

You can use this command to perform search/replace operations on multiple files by following the following steps:

Another way to do the same thing is to use the “tags” feature of Emacs: it includes the command tags-query-replace which performs a query-replace across all the files mentioned in the TAGS file. See Tags Search in The GNU Emacs Manual.