Addendum.
Heureka, I've found it!
The solution is based on a combination of virtcol(".") and byteidx(...):
function! CWord(string, class_start, class_end)
> let l:len = len(substitute(a:string, ".", "x", "g"))
> let l:pos = virtcol(".") - 1
>
> let l:start = l:pos
> while l:start >= 0 && matchstr(a:string, ".", byteidx(a:string,
> l:start)) =~ a:class_start
> let l:start -= 1
> endwhile
>
> let l:end = l:pos
> while l:end < l:len && matchstr(a:string, ".", byteidx(a:string,
> l:end)) =~ a:class_end
> let l:end += 1
> endwhile
>
> let l:start = byteidx(a:string, l:start + 1)
> let l:end = byteidx(a:string, l:end - 1)
>
> return strpart(a:string, l:start, l:end - l:start + 1)
> endfunction
>
Thanks for the comments!
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