Need to Always/Permanently highlight non-ASCII characters
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 I work with a process that breaks if any of the input files have non-ASCII characters in them. It would help tremendously if there was a feature that I could enable that would automatically highlight any such characters whenever I open one of the files. I don’t want to have to manually search for [^\x00-\x7F]+. That’s a pain to have to manually type (let alone remember) every time I open a file. Any way to do this? Thanks in advance! 
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 with a scripting plugin like pythonscript or luascript etc… you can register a callback 
 for BUFFERACTIVATED notification.
 Whenever you open a new document or switch between documents the callback gets called and you could run a check if [^\x00-\x7F]+ is found.
 Sounds interesting for you?
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 @bisdavid If all that is done is to “automatically highlight any such characters whenever I open”, aren’t you still going to have to “search”…because what if said characters aren’t in the current viewable area; you won’t know if a file contains any “bad” characters or not? 

