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<script>
var str="<A HREF=\"http://shop33177104.taobao.com\" target=_blank>四皇冠-七星剑数码专卖店 MP3 MP4 MP5 手机 车载MP3 耳机专卖 </A> ";
var reg=/"(http:\/\/shop[^"]+)/gi;
reg.test(str);
alert(RegExp.$1);//http://shop33177104.taobao.com
str="<span class=\"rank\" level=\"11\" type=\"SELLER\" url=\"http://my.taobao.com/mytaobao/rate/rate.jhtml?
user_id=32ebf28975e44a8bb0802f30a869fab1&faction=show\"> </span>"
reg=/level="(\d+)"/gi;
reg.test(str);
alert(RegExp.$1);//11
str="<span class=\"ww:token\" ww:params=\"nick=alec8688&tnick=alec8681&display=inline\"> </span>";
reg=/(?!t)nick=(\w+)/gi;
alert(reg.test(str));
alert(RegExp.$1);//alec8688
</script>
<script>
var str = '<A HREF="http://shop33177104.taobao.com" target=_blank>四皇冠-七星剑数码专卖店 MP3 MP4 MP5 手机 车载MP3 耳机专卖 </A>';
var arr = str.match(/<a.+?href=\"(.+?)\"/i);
alert(arr[1]);
str = '<span class="rank" level="11" type="SELLER" url="http://my.taobao.com/mytaobao/rate/rate.jhtml?user_id=32ebf28975e44a8bb0802f30a869fab1&faction=show"> </span>';
arr = str.match(/<span.+?level=\"(.+?)\"/i);
alert(arr[1]);
var str = '<span class="ww:token" ww:params="nick=alec8688&tnick=alec8688&display=inline"> </span>';
arr= str.match(/nick=(.+?)&/i);
alert(arr[1]);
</script>