How can I quickly toggle between string and regexp versions of functions such as replace-string/replace-regexp, query-replace/query-replace-regexp etc? Pretty sure I saw a shortcut once but now I cant find it.

  • I am not sure I understand what you mean. The replace- functions are not usually bound to any key, while the query-replace- ones are bound to M-% and C-M-%, respectively. Isn't that already quick enough? It seems to me that remembering the state of some toggle just adds to your cognitive burden. – Harald Hanche-Olsen Apr 7 '18 at 14:18
  • I find C-M-% a bit difficult to press so most of the time I go for M-x and type query-replace-regexp manually. Most of the time I use query-replace (via M-%) but sometimes it would be easier to press M-% and then something else to switch to query-replace-regexp instead. – ext Apr 7 '18 at 14:27
  • In that case, I'd be tempted to turn M-% into a prefix key and bind query-replace to M-% s (s for string) and query-replace-regexp to M-% r. – Harald Hanche-Olsen Apr 7 '18 at 14:43

Like Harald, I'm not sure what kind of answer you expect.

But FWIW, I think the best way to perform such operations is with:

C-s <string1> M-% <string2> RET

in which case the answer is that you can use M-r any time between the C-s and the M-% to toggle between string search and regexp search. You can similarly use M-c to toggle the case-sensitivity.

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    I was not aware of the power of isearch-forward. But it looks like M-r only toggles the search mode, while you still must use C-M-% to run query-replace-regexp? (Unless the docstring for isearch-forward is wrong.) What would be nice is if M-% in this context chose between the two replace commands to match the current search mode – oh, wait, experimentation reveals that it does so! That's a documentation bug, then. – Harald Hanche-Olsen Apr 7 '18 at 15:03
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    Also, if you know you want to start with a regexp isearch and you find C-M-s awkward, by default you can alternatively use C-u C-s. Although depending on your keyboard C-s M-r may still be easier than either of those. – phils Apr 7 '18 at 22:23
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    @HaraldHanche-Olsen I just tested it and M-% does start query-replace-regexp if you use it from a regexp isearch. – Omar Sep 20 '18 at 15:01

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