Replace word under cursor in the file
nnoremap <leader>% :%s/\<<C-r><C-w>\>//gI\|norm``<left><left><left><left><left><left><left><left><left><left>
Replace word under cursor in last selection
nnoremap <leader>< :'<,'>s/\<<C-r><C-w>\>//gI\|norm``<left><left><left><left><left><left><left><left><left><left>