Everything but filehandles? Good luck. You would need a full out parser for that. Even if you had a hash ref of good handles it would still mess those keys up inside of quoted strings. If all you are concerned with is having everthing lower case, forget the handles and do the entire thing with a
$_ = lc( $_ );. Lowercase filehandles work to (although they look awful. Also, use
use IO::File instead of handles and then you really won't have to worry about your filehandles.
Ooops, that brings up a good point, you forgot about package declarations, if you are using any other modules (making good use of code reuse), you will mess them up as well.
By the way, what are you doing this for, the problem might spell a different solution.
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