[syslog-ng] Escape slashes etc in macro variables ($PROGRAM)

Howdy, Is there a option for escaping macro variables such as $PROGRAM? I've seen a couple of discussions about this on the list but they never seem to come to a conclusion. Case in point: I'm creating an output file macro like this: file("/var/log/$SOURCEIP.$PROGRAM.log" ... and Syslog-ng failes to write the file whenever $PROGRAM looks similar to "postfix/quemgr" since its then trying to "create" the directory postfix due to the slash. Of course, thats not what I want. Can this be circumvented somehow? Cheers! Goran