:the literal : (5810 / 728 / 3A16)
\da digit
\da digit
\s+any whitespace character, repeated at least once
Non-Capturing Group(?:\d+\s+|(?:user|daemon|local.?)\.\w+\s+)* *repeats the group contents below any number of times:
\d+a digit, repeated at least once
\s+any whitespace character, repeated at least once
2nd Alternative(?:user|daemon|local.?)\.\w+\s+ Non-Capturing Group(?:user|daemon|local.?) userthe literal text user (case sensitive) daemonthe literal text daemon (case sensitive) localthe literal text local (case sensitive) .?optionally matches any character (except for line terminators)
\.the literal . (4610 / 568 / 2E16)
\w+any word character, repeated at least once
\s+any whitespace character, repeated at least once
\[?optionally matches the literal [ (9110 / 1338 / 5B16)
\wany word character
Character Class[\w\.\-]{2,} {2,}matches at least 2 characters from the set below:
\wany word character
\.the literal . (4610 / 568 / 2E16)
\-the literal - (4510 / 558 / 2D16)
\]?optionally matches the literal ] (9310 / 1358 / 5D16)
\sany whitespace character
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