weekthe literal text week (case sensitive) s?optionally matches the literal s (11510 / 1638 / 7316) (case sensitive)
\h*any horizontal whitespace character, repeated any number of times
\Kresets the starting point of the reported match. Any previously consumed characters are no longer included in the final match
0+the literal 0 (4810 / 608 / 3016) , repeated at least once
Positive Lookahead(?=[1-9]\d*[a-zA-Z]) 1-9one character from 1 (4910) to 9 (5710)
\d*a digit, repeated any number of times
a-zone character from a (9710) to z (12210) (case sensitive)
A-Zone character from A (6510) to Z (9010) (case sensitive)
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