multiline weirdness

gistfile1.txt

# matches and merges events like:
# Dec 28, 2012 8:11:53 PM jenkins.InitReactorRunner$1 onAttained

multiline {
    type => "tomcat"
    pattern => "(^\w{3}\s\d{2}\,\s\d{4}\s[0-9|:]+\s\w{2}\s)"
    what => "next"
  }

# matches stack traces

  multiline {
    type => "tomcat"
    pattern => "(^\d+\serror)|(^.+Exception: .+)|(^\s+at .+)|(^\s+... \d+ more)|(^\s*Caused by:.+)"
    what => "previous"
    exclude_tags => [ "multiline" ]
    add_tag => [ "stacktrace" ]
    add_field => [ "stacktrace", "true" ]
  }