v?optionally matches the literal v (11810 / 1668 / 7616) (case sensitive)
\d+a digit, repeated at least once
-the literal - (4510 / 558 / 2D16)
_the literal _ (9510 / 1378 / 5F16)
\.the literal . (4610 / 568 / 2E16)
Non-Capturing Group(?:\d+\2){1,4} {1,4}repeats the group contents below between 1 and 4 times:
\d+a digit, repeated at least once
\2the text saved by group 2
7zthe literal text 7z (case sensitive) \d+a digit, repeated at least once