split

# File actionpack/lib/action_view/template.rb, line 100
      def split(file)
        if m = file.match(/^(.*\/)?([^\.]+)\.?(\w+)?\.?(\w+)?\.?(\w+)?$/)
          if m[5] # Multipart formats
            [m[1], m[2], "#{m[3]}.#{m[4]}", m[5]]
          elsif m[4] # Single format
            [m[1], m[2], m[3], m[4]]
          else
            if valid_extension?(m[3]) # No format
              [m[1], m[2], nil, m[3]]
            else # No extension
              [m[1], m[2], m[3], nil]
            end
          end
        end
      end