\d+a Unicode decimal digit, repeated at least once
Negated Character Class[^,\d]* *matches any number of characters outside the set below:
,the literal , (4410 / 548 / 2C16)
\da Unicode decimal digit
_the literal _ (9510 / 1378 / 5F16)
Negated Character Class[^,]+ +matches at least one character outside the set below:
,the literal , (4410 / 548 / 2C16)
\S+any character that is not Unicode whitespace, repeated at least once
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