How to replace with expanded tab in vim -

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i don't have problem, i'm curious.

here part of .vimrc.

set tabstop=4 set shiftwidth=4 set expandtab

i want replace in text notab <-here tab

so command should :

:%s/notab/^i<-here tab/

wich give me real tab, in order replace 4 space in need call :retab

same results in single call (directly add 4 spaces):

:%s/notab/ <-here tab/

but not convenient, first version include real tab in text, wich need te retabed , second version depends on number of space defined 1 tab.

is there generalistic way it?

i think should want:

:%s/notab/\=repeat(" ", &tabstop)/ge

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