20.9.1 Unconditional Replacement
- M-x replace-string <RET> string <RET> newstring <RET>
- Replace every occurrence of string with newstring.
To replace every instance of ‘foo’ after point with ‘bar’,
use the command M-x replace-string with the two arguments
‘foo’ and ‘bar’. Replacement happens only in the text after
point, so if you want to cover the whole buffer you must go to the
beginning first. All occurrences up to the end of the buffer are
replaced; to limit replacement to part of the buffer, narrow to that
part of the buffer before doing the replacement (see Narrowing).
In Transient Mark mode, when the region is active, replacement is
limited to the region (see Transient Mark).
replace-string exits, it leaves point at the last
occurrence replaced. It sets the mark to the prior position of point
replace-string command was issued); use C-u
C-<SPC> to move back there.
A numeric argument restricts replacement to matches that are surrounded
by word boundaries. The argument's value doesn't matter.
What if you want to exchange ‘x’ and ‘y’: replace every ‘x’ with a ‘y’ and vice versa? You can do it this way:
M-x replace-string <RET> x <RET> @[email protected] <RET>
M-< M-x replace-string <RET> y <RET> x <RET>
M-< M-x replace-string <RET> @[email protected] <RET> y <RET>
This works provided the string ‘@[email protected]’ does not appear
in your text.