Re: [Suggestion] New functions iskeywordchar(), isfnamechar(), isprintchar(), and isidentchar()

@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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