How can one reverse the letters/characters in a selected region?
xyz --> zyx
ab cde --> edc ba
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2 Answers
Emacs doesn't seem to provide any function to do this out of the box, but implementing one isn't that hard:
(defun my-reverse-region (beg end)
"Reverse characters between BEG and END."
(interactive "r")
(let ((region (buffer-substring beg end)))
(delete-region beg end)
(insert (nreverse region))))
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1
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2Mark my answer as an solution if it helped you.– user12563Commented Jan 17, 2018 at 16:38
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Of course. Usually I wait for a while for alternative solutions, then mark it as accepted.– NameCommented Jan 17, 2018 at 16:43
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4You can also use
delete-and-extract-region, i.e.,(insert (nreverse (delete-and-extract-region beg end))). Commented Jan 17, 2018 at 19:32 -
How do you use it with
Meta + x? If I highlight a region (e.g. theabcstring) and then execute it, I get the following error:Wrong type argument: listp, #("abc" 0 3 (fontified t))Commented Sep 14, 2019 at 20:47
Since emacs can call the shell on a region of text, and since shell can reverse text I believe there's an alternative/elegant(?) solution to the OPs problem,.
That's a comment but not an answer
okay how about
;; select the region, then
C-u M-|
;; Shell command on region:
rev<enter>
answered Jun 27, 2022 at 16:07
