选择器切割正则的进化

    *
      //标签，ID 类 伪类 属性的标识符 它们的主体部分，亲子相邻兄长并联通配符，空白
      var reg = /[\w\u00a1-\uFFFF][\w\u00a1-\uFFFF-]*|[#.:\[][\w\(\)\]]+|\s*[>+~,*]\s*|\s+/g
    *
      //让小括号里面的东西不被切割
      var reg = /[\w\u00a1-\uFFFF][\w\u00a1-\uFFFF-]*|[#.:\[](?:[\w\u00a1-\uFFFF-]|\([^\)]*\)|\])+|(?:\s*)[>+~,*](?:\s*)|\s+/g
    *
      //将属性选择器分离出来
      var reg = /[\w\u00a1-\uFFFF][\w\u00a1-\uFFFF-]*|[#.:](?:[\w\u00a1-\uFFFF-]|\S*\([^\)]*\))+|\[[^\]]*\]|(?:\s*)[>+~,*](?:\s*)|\s+/g
    *
      //缩小后代选择器的范围
      var reg_split = /[\w\u00a1-\uFFFF][\w\u00a1-\uFFFF-]*|[#.:](?:[\w\u00a1-\uFFFF-]|\S+\([^\)]*\))+|\[[^\]]*\]|(?:\s*)[>+~,*](?:\s*)|\s(?=[\w\u00a1-\uFFFF*#.[:])/g




//test
var reg_split =/[\w\u00a1-\uFFFF][\w\u00a1-\uFFFF-]*|[#.:](?:[\w\u00a1-\uFFFF-]|\S+\([^\)]*\))+|\[[^\]]*\]|(?:\s*)[>+~,*](?:\s*)|\s(?=[\w\u00a1-\uFFFF*#.[:])/g;
var reg_trim = /^\s+|\s+$/g
var selector = "div + span  , a";
array = []
selector.replace(reg_split,function(a){
  array.push(a.replace(reg_trim,''))
});
alert(array.join("◆"))