,?optionally matches the literal , (4410 / 548 / 2C16)
\+the literal + (4310 / 538 / 2B16)
\d+a Unicode decimal digit, repeated at least once
_the literal _ (9510 / 1378 / 5F16)
Negated Character Class[^,]+ +matches at least one character outside the set below:
,the literal , (4410 / 548 / 2C16)
g modifier: global. Finds all matches instead of stopping after the first