ArrayMatcher

class ArrayMatcher
  attr_reader :matcher

  def initialize(*matcher)
    @matcher = matcher
  end

  def ===(other)
    matcher.zip(other).all? {|pair| pair.first === pair.last}
  end
end

x = ['a', 'b']

case x
when ArrayMatcher.new(/a/, /c/)
  print 1
when ArrayMatcher.new(/a/, /b/)
  print 2
else
  print 3
end