^start of line
\da Unicode decimal digit
\da Unicode decimal digit
?repeats the group contents below at most once:
\da Unicode decimal digit
\da Unicode decimal digit
-the literal - (4510 / 558 / 2D16)
\d{1,2}a Unicode decimal digit, repeated between 1 and 2 times
-the literal - (4510 / 558 / 2D16)
\d{1,2}a Unicode decimal digit, repeated between 1 and 2 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