nnoremap ,t <S-V>:t.<Bar>s/./=/g<Bar>t-2<CR>:noh<CR> 
nnoremap ,1 <S-V>:t.<Bar>s/./=/g<CR>:noh<CR> 
nnoremap ,2 <S-V>:t.<Bar>s/./*/g<CR>:noh<CR> 
nnoremap ,3 <S-V>:t.<Bar>s/./+/g<CR>:noh<CR> 
nnoremap ,4 <S-V>:t.<Bar>s/./-/g<CR>:noh<CR>