讲解：http://www.jb51.cc/article/p-tfzjazei-gw.html

1.匹配嵌套的div：

<div[^>]*>[^<>]*(((?'Open'<div[^>]*>)[^<>]*)+((?-Open'</div>)[^<>]*)+)*(?(Open)(?!))</div>

2.匹配类似这么的jsonhttp://rate.taobao.com/FeedRateList.htm?callback=jsonp_reviews_list&userNumId=88442756&auctionNumId=27006028977&siteID=4&currentPageNum=1&rateType=&orderType=sort_weight&showContent=1&attribute=

\{\042append\042((?<o>\{)|(?<-o>\})|[^{}]+)*(?(o)(?!))\}