I was playing around with this golf in #perl irc channel the other day and I was wondering if anyoen had any brilliant ideas to better my current solution. The goal is simple, write a sub that finds the number of elements of @y that match elements in @x. Repeated elements in either can be ignored, that is, if @y has "A", "A", and @x has "A", you only need to report one match. @x and @y may be globals so initialization won't count for your strokes, same with the sub boilerplate.

My best is 28 strokes, can you do better?

<Reveal this spoiler or all in this thread>

In reply to Perl Golf-- testing array intersection by BUU

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