^start of line
\d{4}a digit, repeated exactly 4 times
\.the literal . (4610 / 568 / 2E16)
\d{2}a digit, repeated exactly 2 times
\.the literal . (4610 / 568 / 2E16)
\d{2}a digit, repeated exactly 2 times
the literal (3210 / 408 / 2016)
.*any character (except for line terminators), repeated any number of times
\r?optionally matches a carriage return (ASCII 13)
\na line-feed (newline) character (ASCII 10)
\d{4}a digit, repeated exactly 4 times
\.the literal . (4610 / 568 / 2E16)
\d{2}a digit, repeated exactly 2 times
\.the literal . (4610 / 568 / 2E16)
\d{2}a digit, repeated exactly 2 times
\ban ASCII word boundary
.*any character (except for line terminators), repeated any number of times
Non-Capturing Group(?:\r?\n(?!\d{4}\.\d{2}\.\d{2}\b).*)* *repeats the group contents below any number of times:
\r?optionally matches a carriage return (ASCII 13)
\na line-feed (newline) character (ASCII 10)
Negative Lookahead(?!\d{4}\.\d{2}\.\d{2}\b) \d{4}a digit, repeated exactly 4 times
\.the literal . (4610 / 568 / 2E16)
\d{2}a digit, repeated exactly 2 times
\.the literal . (4610 / 568 / 2E16)
\d{2}a digit, repeated exactly 2 times
\ban ASCII word boundary
.*any character (except for line terminators), repeated any number of times
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
i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters