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var reg = /<a(?:[^>]+)href=['"]?([^>\s'"]*)(?:[^>]*)>/;
var arr = ["<a href=http://www.net1.com.cn/>blogs</a>","<a href=http://www.net2.com.cn/ target=top>blogs</a>","<a title=blogs href='http://www.net3.com.cn/' target='_blank'>blogs</a>","<a target='_blank' href=\"http://www.net4.com.cn\">blogs</a>"];
for(var i = arr.length;i--;){
console.log(arr[i].match(reg)[1]);
}