:put =toupper(@")
Registers in Vim are not only for raw replay; you can treat them as string data and transform them at paste time.
registers #registers #expression-register #editing #vimscript
<C-r>=substitute(getreg('+'), '\n\+', ', ', 'g')<CR>
When you paste from the system clipboard into code or config, multiline text often needs to be flattened first.
registers #registers #insert-mode #expression-register #text-processing
"=strftime('%Y-%m-%d %H:%M')<CR>p
The expression register lets you evaluate Vimscript on demand and paste the result immediately.
registers #registers #expression-register #automation #timestamps
"=strftime('%F')<CR>p
The expression register lets you compute text on demand and insert it without leaving Normal mode workflows.
registers #registers #expression-register #normal-mode #automation
:put =''
Using :put ='' with an empty expression lets you insert blank lines in normal mode without ever entering insert mode.
editing #editing #normal-mode #ex-commands #expression-register #blank-line
<C-r>=strftime('%Y-%m-%d')<CR>
The expression register ("=) lets you evaluate any Vimscript expression and insert its result inline.
registers #registers #insert-mode #expression-register #dates
<C-v>jjI\=printf('%02d ', line('.')-line("'<")+1)<CR><Esc>
By combining visual block insert with Vim's expression register, you can insert dynamically computed line numbers at the start of each selected line.
visual-mode #visual-mode #block-mode #line-numbers #expression-register
