Info Catalog efaq: Using regular expressions efaq: Common requests efaq: Documentation for etags

efaq: Replacing text across multiple files

 
 5.37 How do I perform a replace operation across more than one file?
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 Dired mode (‘M-x dired <RET>’, or ‘C-x d’) supports the command
 ‘dired-do-find-regexp-and-replace’ (‘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:
 
    • Assemble a list of files you want to operate on with either
      ‘find-dired’, ‘find-name-dired’ or ‘find-grep-dired’.
 
    • Mark all files in the resulting Dired buffer using ‘t’.
 
    • Use ‘Q’ to start a ‘query-replace-regexp’ session on the marked
      files.
 
    • To accept all replacements in each file, hit ‘!’.
 
    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.  
 (emacs)Identifier Search.
 

Info Catalog efaq: Using regular expressions efaq: Common requests efaq: Documentation for etags