using js to remove js comment

nocomment.js

var nocomment = function(str) {
  var div = document.createElement('div')
    , inline = /([^\\])\/\/[^\n]*(\n?)/g
    , reg = /\/[^\/]*\/g?m?i?[^\*]?/g
    , commentLikeReg = /\/\\\/\*[^\/]*\*\//g
    , string = new RegExp('(\'[^\']*\')|("[^"]*")','g')
    , identifier = 'SOFISH_S_METHOD_TO_REMOVE_JS_COMMENTS_'
    , matches = []
    , counter = 0
    , strReplace;
    
  strReplace = function(reg, str) {
    return str.replace(reg, function(match) {
      matches.push(match);
      return match.replace(match, identifier + (counter++));
    })
  }

  str = str.replace(reg, function(match) {
    var reg, type;
    try {
      reg = eval(match)
    } catch(e) {}
    type = Object.prototype.toString.call(reg);
    return type === '[object RegExp]' ? 
      (matches.push(match), match.replace(match, identifier + (counter++))) : 
      match;
  })
  
  str = strReplace(string, str);
  str = strReplace(commentLikeReg, str);
  
  str = str.replace(/\/\*([^@])/g, '<!-- $1').replace(/[^@](\*\/)/g, ' -->');
  str = str.replace(/(<!-- )[^>]*<!--/g, function(match, selected){
    return match.replace(selected, '*'); 
  });
 
  div.innerHTML = str;
  str = div.textContent;
  
  str = str.replace(inline, function(match, g1, g2){
    return match[0] + g2;
  });
  
  return str.replace(new RegExp(identifier + "(\\d+)", 'g'), function(match, selected) {
    return matches[selected];
  });
}