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Subject: bug#17758: 24.3;
 The line isn't wrapped during printing if it contains non ascii chars
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> (string-match "^[\000-=C3=BF]+" "=C3=A9foo")
> =3D> 0
>=20
> (string-match "^[\000-\377]+" "=C3=A9foo")
> =3D> 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.