Emacs Advent Calendar 11: Replacing

Fri 2015-12-11

Emacs has two modes for searching and replacement. The first one unconditionally replaces all occurences of a searched string, the second one interactively asks what to do for every match.

Unconditional replacement can be invoked with M-x replace-string. It will replace all occurences of the search string with the replacement string after point. So to operate on the whole buffer, point must be at the start. If the region is active, replacements will only be done inside.

An interactive session can be started with M-x query-replace, which is also bound to M-%. It will loop through all matches, asking what to do with each one.

Key Action
<SPC>, y replace
<DEL>, n skip
<RET>, C-g exit without replacement
. replace this match and exit
! replace all remaining matches
^ go back to previous match
C-r enter recursive edit
e edit replacement string
C-h, ? display help

Recursive editing means that the replacing is suspended and you are free to edit the buffer with the usual commands. To resume replacing, press C-M-c.

Some in-between note on Emacs terminology: <DEL> is an Emacs synonym for the backspace key. (By the way, did you notice that it is located directly above <RET> on qwerty keyboards? Useful for quickly deciding on yes/no.)

To restart a canceled replace, press C-x ESC ESC (which, in fact, just repeats the latest command that used the Minibuffer).

For more information see sections 15.10 (Replacement Commands).

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This text by Ludger Sandig is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.