Please add "irc" as a language. Internet Relay Chat messages (which often appear in chat logs) are formatted like, e.g.:
22:25:48 <paravoid> varnish 4.0 technology preview 1 got released... today
22:25:49 <gwicke> not sure that it would need to be LRUed
22:25:51 * AaronSchulz doesn't really get 5
So thus, there are timestamps, usernames (within the angle brackets), messages (after the username) and actions (preceded by an asterisk).