^start of line
Non-Capturing Group(?:\d+\.){3} {3}repeats the group contents below exactly 3 times:
\d+a digit, repeated at least once
\.the literal . (4610 / 568 / 2E16)
\d+a digit, repeated at least once
.*?any character (except for line terminators), repeated any number of times
\[the literal [ (9110 / 1338 / 5B16)
Negated Character Class[^]]* *matches any number of characters outside the set below:
]the literal ] (9310 / 1358 / 5D16)
\]the literal ] (9310 / 1358 / 5D16)
.*?any character (except for line terminators), repeated any number of times
"the literal " (3410 / 428 / 2216)
Negated Character Class[^"]* *matches any number of characters outside the set below:
"the literal " (3410 / 428 / 2216)
"the literal " (3410 / 428 / 2216)
\s*any whitespace character, repeated any number of times
\d+a digit, repeated at least once
\s*any whitespace character, repeated any number of times
\d+a digit, repeated at least once
\s*any whitespace character, repeated any number of times
\s*any whitespace character, repeated any number of times
"the literal " (3410 / 428 / 2216)
Negated Character Class[^"]* *matches any number of characters outside the set below:
"the literal " (3410 / 428 / 2216)
"the literal " (3410 / 428 / 2216)
$end of line
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