\+?optionally matches the literal + (4310 / 538 / 2B16)
\d{0,2}?a digit, repeated between 0 and 2 times
?matches at most one character from the set below:
\sany whitespace character
.the literal . (4610 / 568 / 2E16)
-the literal - (4510 / 558 / 2D16)
\(?optionally matches the literal ( (4010 / 508 / 2816)
\d{3}a digit, repeated exactly 3 times
\)?optionally matches the literal ) (4110 / 518 / 2916)
?matches at most one character from the set below:
\sany whitespace character
.the literal . (4610 / 568 / 2E16)
-the literal - (4510 / 558 / 2D16)
\d{3}a digit, repeated exactly 3 times
?matches at most one character from the set below:
\sany whitespace character
.the literal . (4610 / 568 / 2E16)
-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
m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string