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In my .vimrc,f5 was binded with CheckMark function to change all into ..

function! CheckMark()  
    if search('。')  
        let s:line=search('。')  
        execute s:line . "s/。/\./g" 
    endif   
endfunction  

map <F5> :call CheckMark()<CR>

How to color the selected character with red ,instead of changing it?

1

You can use the :match command to do this:

:highlight CheckMark ctermfg=red guifg=red
:match CheckMark /。/

If you want this highlighting only to occur when you invoke your mapping, you can replace the contents of your CheckMark() function with the :match command.

See :help :match for more details.

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