\d*a digit, repeated any number of times
\.the literal . (4610 / 568 / 2E16)
athe literal a (9710 / 1418 / 6116) (case sensitive)
.any character (except for line terminators)
.any character (except for line terminators)
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