Help with Grok pattern with space in field?

[ZillaG]

I have the following log...

2017-03-27 14:24:50,607 DEBUG :Finalizer thread [com.company.classname]

...and the following filter

filter {
  grok {
    match => {
      "message" => [
        "%{TIMESTAMP_ISO8601:logdate}%{SPACE}%{LOGLEVEL:loglevel}%{SPACE}:%{HELP_WITH_PATTERN:thread}"
      ]
    }
  }
}

What should "HELP_WITH_PATTERN" be so I get thread => "Finalizer thread"

[ZillaG]

I should read my own posts

[whyapenny]

you could also create your own pattern:
NOTBRACKET [^[]+

Then call that:
%{TIMESTAMP_ISO8601:logdate}%{SPACE}%{LOGLEVEL:loglevel}%{SPACE}:%{NOTBRACKET:thread}${GREEDYDATA:theRest}