\d{2}a digit, repeated exactly 2 times
\.the literal . (4610 / 568 / 2E16)
\s+any whitespace character, repeated at least once
.+?any character (except for line terminators), repeated at least once
Positive Lookahead(?=\d{2}\.|$) \d{2}a digit, repeated exactly 2 times
\.the literal . (4610 / 568 / 2E16)
$end of string, or before its final line terminator
g modifier: global. Finds all matches instead of stopping after the first