((grep/^(Sun|Moon)$/, @arr1) == 2) ? (print "True") : (print "False");

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This is not reliable if @arr1 is allowed to contain duplicates, it is deemed to give false positives and false negatives, and the OP wrote nothing about that possibility.

In reply to Re^2: using grep to match more than two words by blazar
in thread using grep to match more than two words by sroy5

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