\D{2}any character that's not a digit, repeated exactly 2 times
\d{2}a digit, repeated exactly 2 times
-the literal - (4510 / 558 / 2D16)
\d{6}a digit, repeated exactly 6 times
\ban ASCII word boundary
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