regular exp tomcat logs graylog

regular exp for "08-Jan-2019 17:42:25.431" tomcat log 
^[0-9]{1,2}-[A-Z,a-z]{3}-[0-9]{4}\s[0-9]{1,2}:[0-9]{1,2}:[0-9]{1,2}[.][0-9]{3}
enable multiline - yes, Multiline pattern is negated = yes 
multiline.negate: true
multiline.match: after

regular exp for space(...) and "Caused by" tomcat log
multiline.pattern: '^[[:space:]]+(at|\.{3})\b|^Caused by:'
enable multiline - yes  
multiline.negate: false
multiline.match: after

check syntax https://www.freeformatter.com/regex-tester.html
https://www.elastic.co/guide/en/logstash/6.2/multiline.html
https://www.elastic.co/guide/en/beats/filebeat/master/_examples_of_multiline_configuration.html