# File lib/vagrant-libvirt/action/handle_box_image.rb, line 149
        def split_size_unit(text)
          if text.kind_of? Integer
            # if text is an integer, match will fail
            size    = text
            unit    = 'G'
          else
            matcher = text.match(/(\d+)(.+)/)
            size    = matcher[1]
            unit    = matcher[2]
          end
          [size, unit]
        end