.*any character (except for line terminators), repeated any number of times
\?the literal ? (6310 / 778 / 3F16)
v=the literal text v= (case sensitive) .+?any character (except for line terminators), repeated at least once
&the literal & (3810 / 468 / 2616)
.+any character (except for line terminators), 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