httpthe literal text http (case sensitive) s?optionally matches the literal s (11510 / 1638 / 7316) (case sensitive)
\S+?any non-whitespace character, repeated at least once
\Qyoutube.com\Ethe literal text youtube.com (case sensitive)
\S+?any non-whitespace character, repeated at least once
v=the literal text v= (case sensitive) \Kresets the starting point of the reported match. Any previously consumed characters are no longer included in the final match
Negated Character Class[^&\s]+ +matches at least one character outside the set below:
&the literal & (3810 / 468 / 2616)
\sany whitespace character
g modifier: global. Finds all matches instead of stopping after the first