\.the literal . (4610 / 568 / 2E16)
Non-Capturing Group(?:js|css) jsthe literal text js (case sensitive) cssthe literal text css (case sensitive) \Kresets the starting point of the reported match. Any previously consumed characters are no longer included in the final match
\?the literal ? (6310 / 778 / 3F16)
v=the literal text v= (case sensitive) \d+a digit, repeated at least once
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