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Vim/Neovim

yank filename without extension to 'f'-registry

:let @f = expand('%:t:r')<CR>

search for "const [contents in 'f'-registry]"

:execute '/const ' . @f<CR>:nohlsearch<CR>

added together

:let @f = expand('%:t:r')<CR>:execute '/const ' . @f<CR>:nohlsearch<CR>

Ideavim

Copy file name to + register and search for it. Do not execute immediately () as CopyFileName also includes the file extension

:action CopyFileName<CR>/const <c-r>+