Negative Lookbehind(?<!\d) \d{3}a digit, repeated exactly 3 times
?matches at most one character from the set below:
.the literal . (4610 / 568 / 2E16)
\sany whitespace character
-the literal - (4510 / 558 / 2D16)
\d{3}a digit, repeated exactly 3 times
?matches at most one character from the set below:
.the literal . (4610 / 568 / 2E16)
\sany whitespace character
-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