unicode equivalent of [A-F]?

Hi,

I have a we page that groups a list of items by splitting it into ranges
that match the first letter.

It not needs to be unicode capable, although the characters will most
likely be in the latin-1 range. Ideally I'd just like to use a unicode
equivalent of [A-Fa-f], [G-Kg-k], etc. 

This may not make sense in a unicode world, however.

Any ideas?

Thanks, Richard

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