\[the literal [ (9110 / 1338 / 5B16)
user id:the literal text user id: (case sensitive) Group user_id(?<user_id>\w+) \w+any word character, repeated at least once
\]the literal ] (9310 / 1358 / 5D16)
\s+any whitespace character, repeated at least once
bythe literal text by (case sensitive) \s+any whitespace character, repeated at least once
\[the literal [ (9110 / 1338 / 5B16)
id:the literal text id: (case sensitive) \w+any word character, 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