According to Eric Hsu:
colors spaces, tabs and ASCII characters below \x21 and above \x7F different colors. I posted the bundle to my web site at
Please highlight characters between \x7f and \x9f but not after that because you'd end up highlighting diacritics (in various LatinN characters sets).
Be also careful that in Unicode (meaning mostly UTF-8/UTF-16), it is more difficult to show invisibles because there are much of them :)