^start of line
\d+a digit, repeated at least once
Non-Capturing Group(?:\.\d+)+ +repeats the group contents below at least once:
\.the literal . (4610 / 568 / 2E16)
\d+a digit, repeated at least once
the literal (3210 / 408 / 2016)
.*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