^start of line
.*?any character (except for line terminators), repeated any number of times
\ban ASCII word boundary
Non-Capturing Group(?:\d{3}|\D+) \d{3}a digit, repeated exactly 3 times
\D+any character that's not a digit, repeated at least once
\.the literal . (4610 / 568 / 2E16)
\w{3}any word character, repeated exactly 3 times
$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