--- URI.unescape(str)
--- URI.decode(str)

    URI ʸǥɤʸ֤ޤ

        require 'uri'
        $KCODE = 'EUC'
        p URI.unescape('http://www.ruby-lang.org/ja/man-1.6/?cmd=view;name=Ruby%A5%EA%A5%D5%A5%A1%A5%EC%A5%F3%A5%B9%A5%DE%A5%CB%A5%E5%A5%A2%A5%EB')

        => "http://www.ruby-lang.org/ja/man-1.6/?cmd=view;name=Rubyե󥹥ޥ˥奢"

