\ban ASCII word boundary
Negative Lookbehind(?<!\.) \.the literal . (4610 / 568 / 2E16)
\d{3}a digit, repeated exactly 3 times
?matches at most one character from the set below:
the literal (3210 / 408 / 2016)
.the literal . (4610 / 568 / 2E16)
-the literal - (4510 / 558 / 2D16)
\d{3}a digit, repeated exactly 3 times
\1the text saved by group 1
\d{4}a digit, repeated exactly 4 times
\.the literal . (4610 / 568 / 2E16)
\ban ASCII word boundary
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