SyntaxFix

[regex] (grep) Regex to match non-ASCII characters?

You don't really need a regex.

printf "%s\n" *[!\ -~]*

This will show file names with control characters in their names, too, but I consider that a feature.

If you don't have any matching files, the glob will expand to just itself, unless you have nullglob set. (The expression does not match itself, so technically, this output is unambiguous.)

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