^start of line
\S+any non-whitespace character, repeated at least once
\sany whitespace character
Group microservice(?<microservice>\S+) \S+any non-whitespace character, repeated at least once
.*any character (except for line terminators), repeated any number of times
MESSAGE=the literal text MESSAGE= (case sensitive) Group message(?<message>.+) .+any character (except for line terminators), repeated at least once
g modifier: global. Finds all matches instead of stopping after the first
m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string