How do I do a case-preserving search and replace in Vim?
:%s/\v(old)/\=toupper(submatch(0)[0]).tolower(submatch(0)[1:])/g
Standard substitutions don't preserve the original case of matched text.
Tag: case
How do you make search case-insensitive by default?
set ignorecase smartcase
Use ignorecase for case-insensitive search.
How do you change the case of text stored in a register?
:let @a = toupper(@a)
Use Vimscript functions toupper() or tolower() with :let @a = toupper(@a) to convert the case of the entire register contents.
How do I change the case of text using operators and motions?
gU{motion} / gu{motion} / g~{motion}
Vim has three case operators that work with any motion or text object: gU for uppercase, gu for lowercase, and g~ for toggle case.
editing #editing #case #operators #text-objects #normal-mode
How do I toggle the case of an entire word in Vim?
g~iw
The g~iw command toggles the case of every character in the word under the cursor — uppercase letters become lowercase and vice versa.