\d{4}a digit, repeated exactly 4 times
\.the literal . (4610 / 568 / 2E16)
\d{2}a digit, repeated exactly 2 times
\.the literal . (4610 / 568 / 2E16)
\d{2}a digit, repeated exactly 2 times
-rthe literal text -r (case sensitive) \d{2,}a digit, repeated at least 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