Positive Lookbehind(?<=\[) \[the literal [ (9110 / 1338 / 5B16)
\d{1,2}a Unicode decimal digit, repeated between 1 and 2 times
\.the literal . (4610 / 568 / 2E16)
\d{1,2}a Unicode decimal digit, repeated between 1 and 2 times
\.the literal . (4610 / 568 / 2E16)
\d{2}a Unicode decimal digit, repeated exactly 2 times
Non-Capturing Group(?:\d{2})? ?repeats the group contents below at most once:
\d{2}a Unicode decimal digit, repeated exactly 2 times
\]the literal ] (9310 / 1358 / 5D16)
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