Although, I appear to have been given the incorrect prefix, as I was told <GA26>. I'll change it to just <GA to catch it all, but you can still use the prefix filter to add it in, Just add in a comma separated list of all the prefixes you wish HeyFu to ignore.
Oh...um...there it is. *blush*
Yeah, I think the number after the GA is a version. Mine was 27 which I assume means whatever GuildAd spamming me at that moment was version 2.7.
I changed line 350 to:
if(self.db.Filters.GuildAds and string.sub(message, 1, 3) == "<GA") then
and I am in business. (I *will* buy the Lua book, any day now.)