Unlang regular expression string expansion.

Hi, HP access point with mac authentication. Sends mac as User-Name in lower case, Sends mac as Calling-Station-ID in upper case. Check to see if mac based authentication is being attempted is if User-Name == Calling-Station-ID. As the case differs the two don't match. if(%{User-Name} =~ /%{Calling-Station-ID}/i){ Doesn't expand %{Calling-Station-ID} , but thats expected. if(%{User-Name} =~ "/%{Calling-Station-ID}/i"){ Gives error. Leaves no way to do case insensitive equality checks between strings with unlang... Any chance of expanding regex strings before passing them to the regex parser ? Or == becomes non-strict equality and === becomes strict equality. Thanks, Arran