On 2013–02–15 Marco Patzer wrote:

> In vim pressing “vis” (visualise inner sentence) marks the current
> sentence, then pressing “g<Ctrl-g>” yields:
> 
> Selected 2 of 4 lines; 14 of 50 words; 82 of 296 bytes
> 
> That means current sentence is 82 bytes long. The rest is up to you.
> Pick a language you like, vim uses its own scripting language but
> also has bindings for python, perl, lua, etc. Pseudo-code:
> 
> go to begin of file
> start:
>   get byte length of sentence
>   if length > max_length
>     % do something
>   fi
>   move on to the next sentence
>   goto start

Here's a quick and naïve vim function which moves the cursor to the
last sentence containing more than 250 bytes when you hit F9.

function! GoToLastTooLongSentence()
  let maxSentenceLength = 250
  while line('.') != 1
    normal ( | yis
    let num = strlen(@")
    if num >= maxSentenceLength
      normal vis  " just for demonstration, remove this
      break
    endif
  endwhile
endfunction
noremap <F9> :call GoToLastTooLongSentence()<cr>

Marco