Repeated

p.. or Repeated[p] is a pattern object that represents a sequence of one or more expressions, each matching p.

Repeated[p, max] represents from 1 to max expressions matching p.

Repeated[p, {min, max}] represents between min and max expressions matching p.

Examples

Match one or more integers:

Cases[{{1, 2}, {a, b}, {3}}, {_Integer ..}]
(* {{1, 2}, {3}} *)

Match exactly two elements:

MatchQ[{a, b}, {Repeated[_, {2}]}]
(* True *)

Please visit the official Wolfram Language Reference for more details.