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Comment by chjj | Hacker News Reader

Just an aside: is there a vim syntax command to highlight weird unicode whitespace as an error?

Something like:

        syn match unicodeWhitespace /[list of unicode whitespace]/
        hi def link unicodeWhitespace Error

I wouldn't know about the Vim equivalent, but I wrote this in my Emacs config long ago:

    (defun find-non-ascii ()
      "Find and show all of the non-ascii characters."
      (interactive)
      (occur "[[:nonascii:]]"))

It has proved quite useful on occasion.

(Yes, I could just invoke Occur directly, but I can never quite remember the regexp character class and syntax here.)

No worries. I managed to whip something up:

        autocmd BufWinEnter * match ErrorMsg /[\xa0\u1680\u2000-\u200a\u202f\u205f\u3000]/

For non-breaking spaces specifically, there is :help 'list'.