?repeats the group contents below at most once:
\[the literal [ (9110 / 1338 / 5B16)
Group datetime(?P<datetime>.+) .+any character (except for line terminators), repeated at least once
\]the literal ] (9310 / 1358 / 5D16)
\[the literal [ (9110 / 1338 / 5B16)
Group thread(?P<thread>[^\]]+) Negated Character Class[^\]]+ +matches at least one character outside the set below:
\]the literal ] (9310 / 1358 / 5D16)
\]the literal ] (9310 / 1358 / 5D16)