^start of line
\d{1,3}a digit, repeated between 1 and 3 times
*repeats the group contents below any number of times:
\\the literal \ (9210 / 1348 / 5C16)
d{3}the literal d (10010 / 1448 / 6416) (case sensitive), repeated exactly 3 times
,the literal , (4410 / 548 / 2C16)
\d{2}a digit, repeated exactly 2 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