\(the literal ( (4010 / 508 / 2816)
1-9one character from 1 (4910) to 9 (5710)
\da digit
\)the literal ) (4110 / 518 / 2916)
\sany whitespace character
9?optionally matches the literal 9 (5710 / 718 / 3916)
\d{4}a digit, repeated exactly 4 times
-the literal - (4510 / 558 / 2D16)
\d{4}a digit, repeated exactly 4 times
g modifier: global. Finds all matches instead of stopping after the first