What is the best way to chop a string into chunks of a given length in Ruby?

Question

I have been looking for an elegant and efficient way to chunk a string into substrings of a given length in Ruby.

So far, the best I could come up with is this:

Answer 1

test.split(/(...)/).reject {|v| v.empty?}

The reject is necessary because it otherwise includes the blank space between sets. My regex-fu isn't quite up to seeing how to fix that right off the top of my head.