@Andy
Thanks for the answer!
The split on '\zs' was new to me. Made some speed tests and found that for
lines with more than 180 chars the first solution is faster, and for
shorter lines the solution below, which is based on the split() approach.
Opted for the new solution as short lines are much more common.
function! CWord(string, class_start, class_end)
> let l:chars = split(a:string, '\zs')
> let l:len = len(l:chars)
> let l:pos = virtcol(".") - 1
>
> let l:start = l:pos
> while l:start >= 0 && l:chars[l:start] =~ a:class_start
> let l:start -= 1
> endwhile
>
> let l:end = l:pos
> while l:end < l:len && l:chars[l:end] =~ a:class_end
> let l:end += 1
> endwhile
>
> return join(l:chars[l:start + 1:l:end - 1], '')
> endfunction
>
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