# File lib/chef/provider/package/yum.rb, line 35
            def version_parse(evr)
              return if evr.nil?

              epoch = nil
              # assume this is a version
              version = evr
              release = nil

              lead = 0
              tail = evr.size

              if evr =~ %r{^([\d]+):}
                epoch = $1.to_i
                lead = $1.length + 1
              elsif evr[0].ord == ":".ord
                epoch = 0
                lead = 1
              end

              if evr =~ %r{:?.*-(.*)$}
                release = $1
                tail = evr.length - release.length - lead - 1

                if release.empty?
                  release = nil
                end
              end

              version = evr[lead,tail]
              if version.empty?
                version = nil
              end

              [ epoch, version, release ]
            end