'@@ -the literal text '@@ - \d+a Unicode decimal digit, repeated at least once
,?optionally matches the literal , (4410 / 548 / 2C16)
\d*a Unicode decimal digit, repeated any number of times
the literal (3210 / 408 / 2016)
\+the literal + (4310 / 538 / 2B16)
\d+a Unicode decimal digit, repeated at least once
,?optionally matches the literal , (4410 / 548 / 2C16)
?repeats the group contents below at most once:
\d*a Unicode decimal digit, repeated any number of times
g modifier: global. Finds all matches instead of stopping after the first