Replace invisible characters in linux vi ^@^A\^M etc.

を ^@ に置き換えると

:%s/\%x00/ /g

インフォメーション

http://unix.stackexchange.com/questions/217010/search-and-replace-control-characters-m-i-in-vi

http://bbs.csdn.net/topics/350032198

http://www.bubuko.com/infodetail-1597967.html