I missed the regex. Yep, that's what it says. 0x7F is the "del" char, so it's non-printing. I think the characters from 0xC0 - 0xFF are out because they would all be interpreted in UTF-8 as signaling the start of a multi-byte character. 0x80 - 0xBF can all be interpreted as trailing elements of a multibyte character, so I guess it's a bad plan to have one lying around loose. [This Wikipedia article](https://en.wikipedia.org/wiki/UTF-8) was informative.
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