How to get Vim to highlight non-ascii characters?

Question

I\'m trying to get Vim to highlight non-ASCII characters. Is there an available setting, regex search pattern, or plugin to do so?

Answer 1

Someone already have answered the question. However, for others that are still having problems, here is another solution to highlight non-ascii characters in comments (or any syntax group in the matter). It's not the best, but it's a temporary fix.

One may try:

:syntax match nonascii "[^\u0000-\u007F]" containedin=ALL contained |
            \ highlight nonascii ctermfg=yellow guifg=yellow

This has mix parts from other solutions. You may remove contained, but, from documentation, there may be potential problem of recursing itself (as I understand). To view other defined patterns, syn-contains section would contain it.

:help syn-containedin
:help syn-contains 

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Replicated issue from: Set item to higher highlight priority on vim