# File lib/cgikit/utilities.rb, line 172
    def unescape_html( string )
      string.gsub(/&(.*?);/n) do
        match = $1.dup
        case match
        when /\Aamp\z/ni           then '&'
        when /\Aquot\z/ni          then '"'
        when /\Agt\z/ni            then '>'
        when /\Alt\z/ni            then '<'
        when /\A#0*(\d+)\z/n       then
          if Integer($1) < 256
            Integer($1).chr
          else
            if Integer($1) < 65536 and \
              ($KCODE[0] == ?u or $KCODE[0] == ?U)
              [Integer($1)].pack("U")
            else
              "&##{$1};"
            end
          end
        when /\A#x([0-9a-f]+)\z/ni then
          if $1.hex < 256
            $1.hex.chr
          else
            if $1.hex < 65536 and \
              ($KCODE[0] == ?u or $KCODE[0] == ?U)
              [$1.hex].pack("U")
            else
              "&#x#{$1};"
            end
          end
        else
          "&#{match};"
        end
      end
    end