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

For other (from now on less unlucky) folks ending up here via a search engine and can't accomplish highlighting of non-ASCII characters, try this (put this into your .vimrc):

highlight nonascii guibg=Red ctermbg=1 term=standout
au BufReadPost * syntax match nonascii "[^\u0000-\u007F]"

This has the added benefit of not colliding with regular (filetype [file extension] based) syntax definitions.