I find this list invaluable when dealing with any job that requires one to parse with python.
I wouldn't use perl for parsing large/complex logs - just for the readability (the speed on perl lacks for me (big jobs) - but that's probably my perl code (I must improve)).
However if grep suits your needs perfectly for now - there really is no reason to get bogged down in writing a full blown parser. Simplest solution is usually the best, and grep is a fine tool.
