I created this regex extraction, that extracts fields for the majority of Symantec Messaging Gateway's logs:
^<142>(?P<date>\w+\s+\d+)\s+(?P<time>[^ ]+)\s+(?P<server>\w+)\s+(?P<process_name>[a-z]+)\[(?P<process_number>\d+)[^ \n]* (?P<process_id>[^\|]+)\|(?P<message_id>[^\|]+)\|(?P<action>IRCPTACTION|VERDICT|UNTESTED|FIRED|SENDER|LOGICAL_IP|EHLO|MSG_SIZE|MSGID|SOURCE|SUBJECT|ORCPTS|TRACKERID|ATTACH|UNSCANNABLE|VIRUS|DELIVER|ACCEPT)(?:(?:(?<=ACCEPT|DELIVER|LOGICAL_IP)\|(?P<src>[^:\s]+)(?::(?P<port>[0-9]+))?(?:\|(?P<to>[^\s]+))?)|(?:(?<=FIRED|IRCPTACTION|ORCPTS|TRACKERID|UNTESTED|VERDICT)\|(?P<recipient>[^\s\|]+)(?:\|)?(?P<result>[a-z][^\|\s]+)?(?:\|(?P<result_2>[a-z][^\|]+))?(?:\|(?P<result_3>.+))?)|(?:(?<=SENDER)\|(?P<from>[^\s]+))|(?:(?<=MSG_SIZE)\|(?P<msg_size>\w+))|(?:(?<=SUBJECT)\|(?P<subject>.*))|(?:(?<=ATTACH)\|(?P<attachment>.+))|(?:(?<=UNSCANNABLE)\|(?P<reason>.+))|(?:(?<=VIRUS)\|(?P<virus_name>.+))|(?:(?<=EHLO)\|(?P<fqdn>.+)))?
I wrote a short blog post about it here: http://alec.dhuse.com/?p=217
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