​

​

​

function parse(subselector) {

  var obj = {tags:[], classes:[], ids:[], attrs:[]};

  subselector.split(/(?=\.)|(?=#)|(?=\[)/).forEach(function(token){

    switch (token[0]) {

      case '#':

         obj.ids.push(token.slice(1));

        break;

      case '.':

         obj.classes.push(token.slice(1));

        break;

      case '[':

         obj.attrs.push(token.slice(1,-1).split('='));

        break;

      default :

         obj.tags.push(token);

        break;

    }

  });

  return obj;

}

​

console.log(parse('div.someClass#id[key=value][key2=value2].anotherClass'));

​