\ban ASCII word boundary
\d{1,3}a digit, repeated between 1 and 3 times
Non-Capturing Group(?:,\d{3})* *repeats the group contents below any number of times:
,the literal , (4410 / 548 / 2C16)
\d{3}a digit, repeated exactly 3 times
\.the literal . (4610 / 568 / 2E16)
\d+a digit, repeated at least once
\p{Zs}+a space separator with non-zero width, repeated at least once
SARthe literal text SAR (case sensitive) \ban ASCII word boundary
g modifier: global. Finds all matches instead of stopping after the first