Log/file monitoring based on occurrence?

what I'm looking for is whether or not there's a way to have Xymon monitor
those logs/files to look for X entries/occurrences within Y amount of time.

I have not played around with it much - been on my list for a while -
but this is a task made for "sec" (Simple Event Correlator)

http://simple-evcorr.sourceforge.net/