JAVACLASS (?:[a-zA-Z$_][a-zA-Z$_0-9]*\.)*[a-zA-Z$_][a-zA-Z$_0-9]*

#Space is an allowed character to match special cases like 'Native Method' or 'Unknown Source'

JAVAFILE (?:[A-Za-z0-9_. -]+)

#Allow special <init>, <clinit> methods

JAVAMETHOD (?:(<(?:cl)?init>)|[a-zA-Z$_][a-zA-Z$_0-9]*)

#Line number is optional in special cases 'Native method' or 'Unknown source'

JAVASTACKTRACEPART %{SPACE}at %{JAVACLASS:class}\.%{JAVAMETHOD:method}\(%{JAVAFILE:file}(?::%{NUMBER:line})?\)

# Java Logs

JAVATHREAD (?:[A-Z]{2}-Processor[\d]+)

JAVACLASS (?:[a-zA-Z0-9-]+\.)+[A-Za-z0-9$]+

JAVAFILE (?:[A-Za-z0-9_.-]+)

JAVALOGMESSAGE (.*)

# MMM dd, yyyy HH:mm:ss eg: Jan 9, 2014 7:13:13 AM

CATALINA_DATESTAMP %{MONTH} %{MONTHDAY}, 20%{YEAR} %{HOUR}:?%{MINUTE}(?::?%{SECOND}) (?:AM|PM)

# yyyy-MM-dd HH:mm:ss,SSS ZZZ eg: 2014-01-09 17:32:25,527 -0800

TOMCAT_DATESTAMP 20%{YEAR}-%{MONTHNUM}-%{MONTHDAY} %{HOUR}:?%{MINUTE}(?::?%{SECOND}) %{ISO8601_TIMEZONE}

CATALINALOG %{CATALINA_DATESTAMP:timestamp} %{JAVACLASS:class} %{JAVALOGMESSAGE:logmessage}

# 2014-01-09 20:03:28,269 -0800 | ERROR | com.example.service.ExampleService - something compeletely unexpected happened...

TOMCATLOG %{TOMCAT_DATESTAMP:timestamp} \| %{LOGLEVEL:level} \| %{JAVACLASS:class} - %{JAVALOGMESSAGE:logmessage}