\ban ASCII word boundary
2-9one character from 2 (5010) to 9 (5710)
\d{3}a digit, repeated exactly 3 times
\sany whitespace character
\d{4}a digit, repeated exactly 4 times
\sany whitespace character
\d{4}a digit, repeated exactly 4 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