NSMutableAttributedString in RubyMotion

gistfile1.rb

      # build attributed string to display the card
      mutando = NSMutableAttributedString.alloc.initWithString(display_text)

      # assign fonts and colors to regions of mutable string
      [ /^(.*)$/, NSFontAttributeName, UIFont.fontWithName("Avenir", size: 16), # font for all
        /^(.*)$/, NSForegroundColorAttributeName, "#696969".to_color,           # color for all
        /(^|\s|,)#([a-zA-Z0-9]*)/, NSForegroundColorAttributeName, "#444444".to_color, # tag
        "\u00B6", NSForegroundColorAttributeName, "#e3e3e3".to_color            # pilcrow
      ].each_slice(3).map do |rx,attr,style|
        display_text.to_enum(:scan, rx)
          .map { m=Regexp.last_match; [m.begin(0),(m.end(0)-m.begin(0))] }
          .each { |range| mutando.addAttribute(attr,
                                  value: style,
                                  range: range )}
      end