set incsearch
set hlsearch
set ignorecase
function GetVisualSelection()
  let raw_search = @"
  let @/=substitute(escape(raw_search, '/.*$^~[]'), "n", '\n', "g")
endfunction
xnoremap // ""y:call GetVisualSelection()<bar>:set hls<cr>
if has('nvim')
  set inccommand=nosplit
  xnoremap /s ""y:call GetVisualSelection()<cr><bar>:%s/
else
  xnoremap /s ""y:call GetVisualSelection()<cr><bar>:%s//
endif