russian characters in text

Hi

I have an interesting thing to do:

I have to process a text file containing russian characters - encapsulated with english strings.
I have to get the russian strings, but I have 2 issues with it:

1) There is no rule to identify where it starts, so I guess I need to use some regular expression, but I absolutely don't know how to do it. Maybe I have get back the ascii code of each character of the string to check if it is a russian or not.

2) If I evaluate the contents of the cells, I found, that russian characters appeart as ??-s in the immediate window, so it is not possible to make any check, I guess, this is the problem to solve first, which obviously possible, as I guess, excel is in used in Russia, too.

Can somebody advice how to start with this?

Thanks