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>I'd like the analogue of strtran but with case insentitive. Anyway, I've just checked the form code and found, that I always use the same convention: SiteMstr, PropMstr, TranMstr, so this is not a problem.

With strtran() this would work :
lcString = strtran(upper(lcString), 'SITEMSTR', 'SiteMstr')
Cetin