I realize this guy is probably not coming back but I felt like this was moderately interesting.

Again Untested, and still requires the GetADUserGroups UDF linked above.

 Code:
Function InGroupLIKE($LikeGroup,optional $Groups)
  if ubound($groups)=-1
    $groups=GetADUserGroups()
  endif
  $InGroupLIKE=iif(ascan($groups,$LikeGroup,,,1)>-1,1,0)  
Endfunction