Smart rule case sensitive regex

What is the current functionality regarding regular expressions in smart rules?
It seems that the current version 3.9.9 of DT doesn’t consider the modifier (?-i), meaning it doesn’t support case-sensitive matching.
I have the impression that DT doesn’t consider the regexp in the Scan Text action at all. In any case, the smart rule returns all records in the search range, regardless of whether I use (?-i)(\bGHT\b), (?-i)(GHT), or simply (GHT) as the regular expression. Or what am I doing wrong?


(See also "Case Sensitive" option in Search - #8 by BLUEFROG)

On the other hand, a Spotlight search for “GHT” apparently returns all hits available in DT! And I’ve always wondered why Spotlight should index the documents archived in DT!