JUST TCP stream iRule

I have a standard VS with a blank stream profile applied. I applied the iRule below. The rule gets hit, but the stream never gets matched. What am I missing?

when CLIENT_ACCEPTED {

STREAM::expression {@ORA-01403@ORA-01403@}

STREAM::enable

}

when STREAM_MATCHED {

set hsl [HSL::open -proto UDP -pool HIGHSPEEDLOGGING]

HSL::send $hsl "DNA_STREAM,MATCH FOUND!"

}