New parser that handles both the old as well as the new format.
Old line format:
[Fri Sep 09 10:42:29 2011] [error] [client 72.15.99.187] File does not exist: /usr/local/apache2/htdocs/favicon.ico
New line format:
[Fri Sep 09 10:42:29.902022 2011] [core:error] [pid 35708:tid 4328636416] [client 72.15.99.187] File does not exist: /usr/local/apache2/htdocs/favicon.ico