?repeats the group contents below at most once:
\(the literal ( (4010 / 508 / 2816)
\d{3}a digit, repeated exactly 3 times
Uses the first branch if group 1 matched
If the condition is true, match this branch:\) \)the literal ) (4110 / 518 / 2916)
Otherwise, match this branch:- -the literal - (4510 / 558 / 2D16)
\d{3}a digit, repeated exactly 3 times
-the literal - (4510 / 558 / 2D16)
\d{4}a digit, repeated exactly 4 times
m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string
i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters
g modifier: global. Finds all matches instead of stopping after the first