js unicode string transcoding

Six months did not write a blog ... not much BB, directly on the code

  uniencode = text => {
    text = escape(text.toString()).replace(/\+/g, '%2B');
    var matches = text.match(/(%([0-9A-F]{2}))/gi);
    if (matches) {
      for (var matchid = 0; matchid < matches.length; matchid++) {
        var code = matches[matchid].substring(1, 3);
        if (parseInt(code, 16) >= 128) {
          text = text.replace(matches[matchid], '%u00' + code);
        }
      }
    }
    text = text.replace('%25', '%u0025');

    return text;
  };