[syslog-ng] pattern matching against raw input?

Is there a way to parse against raw input, with syslog-ng? I'm writing patterns for Cisco devices and the PROGRAM macro appears to be gobbling (and then removing) the %FACILITY-SEVERITY-MNEMONIC text, prior to the parser getting access [to the message], for Cisco ASA devices. In other cases, PROGRAM gobbles the log sequence number (from cisco ios) and leaves the date/time and FAC-SEV-MNEMONIC code intact.