正则表达式笔记

1.从span里面拿取一个属性

    var b='全额翁群二群翁群<span style="color: rgb(255, 0, 0);" id="1550629749912" primary="true" synonym="点赞活动" similar="" synonym_id="3043" similar_id="" word_extract="">翁错</span><span style="color: rgb(255, 0, 0);" id="1550629749912" primary="true" synonym="点赞活动" similar="" synonym_id="3043" similar_id="" word_extract="">翁错</span>'

取出word_extract里面的值的正则表达式

              var r = /word_extract="([^"]*)"/g
          var result;
                        
         while ((result = r.exec(b)) != null)     
                {

            if(result[1]){
                                
                    }
        }