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This reminds me of the substitution mode of Tim Pope's amazing vim plugin [abolish](https://github.com/tpope/vim-abolish?tab=readme-ov-file#subs...)

Basically in vim to substitute text you'd usually do something with :substitute (or :s), like:

:%s/textToSubstitute/replacementText/g

...and have to add a pattern for each differently-cased version of the text.

With the :Subvert command (or :S) you can do all three at once, while maintaining the casing for each replacement. So this:

textToSubstitute

TextToSubstitute

texttosubstitute

:%S/textToSubstitute/replacementText/g

...results in:

replacementText

ReplacementText

replacementtext



The Emacs replace command[1] defaults to preserving UPCASE, Capitalized, and lowercase too.

[1] https://www.gnu.org/software/emacs/manual/html_node/emacs/Re...


Of course it does. Or it wouldn’t be Emacs


Also just realised while looking at the docs it works for search as well as replacement, with:

:S/textToFind

matching all of textToFind TextToFind texttofind TEXTTOFIND

But not TeXttOfFiND.

Golly!


In vim, I believe there's a setting that you can flip to make search case sensitive.

In my setup, `/foo` will match `FoO` and so on, but `/Foo` will only match `Foo`


There's undoubtedly a setting but if you don't want it on all the time you can always add \c at the end of the search term, like /foo\c to denote case insensitivity




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