accented characters in class expression fail

[paleolith]

It appears that using any of these characters:

í ü ç å á

within a class expression fails to find the characters. For example, if the entire file is just

íüçåá

and the find regular expression is

[íüçåá]

the result is nothing found. The other common accented characters which I've tried work as expected. (I haven't tried upper case.) Finding each character individually, non-RE, works.

Is there any known reason for this? Any reason not to submit it as a bug? (I've tried searching the forum, but "accented" only comes up with one unrelated posting, and "class expression" gets too many hits because there's no phrase search AFAIK.)

Edward