Tweaked log on string pattern to parse servers such as mine (1.5.2 MCPC+) which use the format:
2013-11-10 02:28:53 [INFO] PlayerName[/IP:Port] logged in with entity id 379270 at ([world] 391.6636055768481, 63.0, -8426.992445585516)
#!/usr/bin/perl
# Copyleft 2013 systemv
# GPL'd, etc..
#...