search highlighting will be removed when you next press Enter.
" Clears search highlighting by just hitting a return.
" The <BS> clears the command line.
" (From Zdenek Sekera [firstname.lastname@example.org] on the vim list.)
" Guido@VanHoecke.org added the final <cr> to restore the standard behaviour of
" <cr> to go to the next line
:nnoremap <CR> :noh<CR>/<BS><CR>
found in the comments of vim Tip #1