" remove non breaking spaces
highlight NBSP ctermbg=red guibg=red
match NBSP /\%u00a0/
autocmd BufWinEnter * match NBSP /\%u00a0/
autocmd InsertEnter * match NBSP /\%u00a0/
autocmd InsertLeave * match NBSP /\%u00a0/
autocmd BufWinLeave * call clearmatches()
autocmd BufWritePre * %s/\%u00a0/\ /ge

" highlight trailing space
highlight ExtraWhitespace ctermbg=red guibg=red
match ExtraWhitespace /\s\+$/
autocmd BufWinEnter * match ExtraWhitespace /\s\+$/
autocmd InsertEnter * match ExtraWhitespace /\s\+\%#\@<!$/
autocmd InsertLeave * match ExtraWhitespace /\s\+$/
autocmd BufWinLeave * call clearmatches()
autocmd BufWritePre * %s/\s\+$//e