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[Not a direct answer to your question - but a useful technique nevertheless] If you place your cursor on any character (including such "invisible characters") and do C-u C-x = (i.e. call the command what-cursor-position with a prefix argument, you get a help page that gives you most (all?) the information that emacs knows about the character at ...


Maybe, these characters are non breakable characters : You can do a search on it. C-s , C-x 8 <space> .

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