From weird log format to hash. (for logstash filter)

dodgylogparsing.rb

log = "DateTime: 23/04/1998\r\nI'm just a message\r\nKey: value\r\nIm a url: http://cats.com\r\nError Description: I'm an error here is my stacktrace\r\n    at stuff\r\n    at more stuff\r\n\key with no value: \r\nI'm another random message line\r\n--------------------------------------------"

rows = log.split(/\r\n/).partition{|x| x.start_with?('Error Description: ','    at')}
event = {'Error'=>rows[0].join($/).sub('Error Description: ','')}
remove = []
rows[1].each do |i|
	i.scan(/(.+): (.*)/) do |x,y|
		event[x.delete(' ')] = y
		remove.push(i)
	end
end
event['message'] = rows[1].reject{|x| x.start_with? *remove, '------'}.join($/)
print event