    # File lib/core/facets/string/margin.rb, line 17
      def margin(n=0)
        #d = /\A.*\n\s*(.)/.match( self )[1]
        #d = /\A\s*(.)/.match( self)[1] unless d
        d = ((/\A.*\n\s*(.)/.match(self)) ||
            (/\A\s*(.)/.match(self)))[1]
        return '' unless d
        if n == 0
          gsub(/\n\s*\Z/,'').gsub(/^\s*[#{d}]/, '')
        else
          gsub(/\n\s*\Z/,'').gsub(/^\s*[#{d}]/, ' ' * n)
        end
      end