Regexp pattern not working

Elastic Stack Beats
3

Hi Magnus,

2016-02-15 16:06:00 ERROR BingoChampions [pool-54-thread-1] [StandardIntegrationImpl.java:650] Finalizado proceso de historificacion de transacciones
        at sun.reflect.GeneratedConstructorAccessor594.newInstance(Unknown Source) ~[na:na]
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.6.0_34]
        at java.lang.reflect.Constructor.newInstance(Constructor.java:534) ~[na:1.6.0_34]

If the log looks like that, never sends to logstash, because when i disable multiline and restart filebeat, it sends all messages remaining.

Thanks