\d+a digit, repeated at least once
\s*any whitespace character, repeated any number of times
\.the literal . (4610 / 568 / 2E16)
\s*any whitespace character, repeated any number of times
*?matches any number of characters from the set below:
\wany word character
\Wany non-word character
Positive Lookahead(?=[aA]\)) athe literal a (9710 / 1418 / 6116) (case sensitive)
Athe literal A (6510 / 1018 / 4116) (case sensitive)
\)the literal ) (4110 / 518 / 2916)
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