bug#17758: 24.3; The line isn't wrapped during printing if it contains non ascii chars

[Mattias Engdegård]

> (string-match "^[\000-ÿ]+" "éfoo")
> => 0
> 
> (string-match "^[\000-\377]+" "éfoo")
> => nil

Yes, this is by design. The former is the range U+0000..U+00FF and covers 
Latin-1. The latter covers ASCII and raw bytes, but no non-ASCII Unicode 
characters.

It is what we get when one interval endpoint is ASCII and the other a raw byte; 
it is mainly intended for regexp matching in unibyte text. Since the Emacs 
multibyte encoding puts the raw bytes 80..FF at the very end of the character 
numbering, [\000-\377] would include every Unicode character (which would be 
very surprising) if we didn't have this mechanism.