How to select every nth element from a matched set?

How to select every nth element from a matched set?

I know you can use :even or :odd to get the even or odd indexes from a set, or :lt/:gt to filter down the matched set before/beyond the specified index. But what if I want to select every 5th element? And I know it's not nth-child, because that selects everything that is the nth-child of it's parent and not if it is one of the nth elements in the matched set. Is the only way to use .each(function (index) {...}); and then check if the index makes that element one of the nth items?

Thanks