Tools to analyze syslog logs

Hello,

What tool do you use to analyze syslog logs?

All tools I can see in the ports seems to rely heavily on some big
configuration file, that had tons of regexp to filter the event messages.

I am wondering if some tool exists that would try to make a
classification of the event messages; that one could use to say "this
type of message" is close to "that type of message" hence thy should be
treated the same way, etc.

Best regards,

Olivier