Parsing thread number in grok


I'm trying to parse a logline in grok but I can't get past the thread number in my log lines.

Example logline:

428 31/05/2017 08:11:53.243	T[63] INFO Service.Internal.ReturnUserType INTERNAL\test_cf --+End of method

My grok till this issue

%{NUMBER:linenumber} (?<datestamp>%{MONTHDAY}/%{MONTHNUM}/%{YEAR} %{TIME}) 

I tried for example (?<thread>T[%{NUMBER}]) but this doesn't work.

What am I doing wrong? Thanks in advance!

Found the solution. I had to escape the brackets.
So the following grok fixed it for me:

I suppose [ and ] is a special charater, jsut escape it.

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