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<script>
var a = [{"poi":"IJJDBGZUACGCTX","id":5170931,"ico":1,"msg":{"d":"中山三路33号中华广场1楼西门1516铺","r":195,"p":"83738221","n":"猫屎咖啡店(中华广场店)","ss":40,"m":"http://i1.dpfile.com/2011-06-01/8112768_m.jpg","i":27}},{"poi":"IJIWWSZUABISTA","id":517031,"ico":2,"msg":{"d":"沿江中路183号","r":769,"p":"83336156","n":"1920咖啡厅(沿江中店)","ss":45,"m":"http://i3.dpfile.com/2008-06-10/581420_m.jpg","i":440}},{"poi":"IJREHWZUADVJVK","id":5170927,"ico":3,"msg":{"d":"天河路603号之101号广武酒店1楼","r":91,"p":"87544117","n":"猫屎咖啡店(天河路店)","ss":40,"m":"http://i3.dpfile.com/2011-06-28/8451689_m.jpg","i":26}},{"poi":"IJIJVBZUAAVDIA","id":2089369,"ico":4,"msg":{"d":"沙面大街50-52号","r":2222,"p":"81214080","n":"星巴克(沙面店)","ss":45,"m":"http://i2.dpfile.com/2008-08-10/793564_m.jpg","i":166}},{"poi":"IJJEIJZUABCDFR","id":4565789,"ico":5,"msg":{"d":"南田路荣德街16号","r":20,"p":"34378610","n":"影像咖啡屋","ss":35,"m":"http://i2.dpfile.com/2011-04-27/7634773_m.jpg","i":77}},{"poi":"IJJHWDZUACICUH","id":2117332,"ico":6,"msg":{"d":"署前路1号","r":43,"p":"87603637","n":"Bucatini","ss":45,"m":"http://i1.dpfile.com/2008-12-13/1301007_m.jpg","i":32}},{"poi":"IJJCDAZUACGBUA","id":1945339,"ico":7,"msg":{"d":"中山三路东平大马路3号","r":309,"p":"83842093","n":"乔蔓咖啡(中山三路店)","ss":40,"m":"http://i3.dpfile.com/2011-06-27/8445776_m.jpg","i":245}},{"poi":"IJRCREZUADSIWW","id":3033721,"ico":8,"msg":{"d":"天河东路75号太古汇1楼107铺","r":73,"p":"87591558","n":"Boca Cafe","ss":45,"m":"http://i1.dpfile.com/2009-08-18/2536191_m.jpg","i":154}},{"poi":"IJRBBDZUADJHDR","id":4517373,"ico":9,"msg":{"d":"天河路230-232号万菱汇1楼","r":88,"p":"38992010","n":"COSTA COFFEE(万菱汇店)","ss":40,"m":"http://i3.dpfile.com/2011-01-03/6357167_m.jpg","i":40}},{"poi":"IJJWFDZUADFTGU","id":4110496,"ico":10,"msg":{"d":"体育西路55号天河又一城B028铺","r":313,"p":"85586895","n":"尚大咖啡烘焙(天河又一城店)","ss":40,"m":"http://i1.dpfile.com/2010-05-17/4317900_m.jpg","i":87}},{"poi":"IJIEBDZUABRGTI","id":4124015,"ico":11,"msg":{"d":"西华路司马街18号108","r":19,"p":"18820765577","n":"鱼子的女仆店","ss":30,"m":"http://i3.dpfile.com/2011-03-04/6955976_m.jpg","i":61}},{"poi":"IJJIRRZUABDCDA","id":2685946,"ico":12,"msg":{"d":"江南西路紫山大街12号102铺","r":94,"p":"84238275","n":"木马","ss":35,"m":"http://i2.dpfile.com/2008-08-13/804418_m.jpg","i":104}},{"poi":"IJJRBVZUACJBEJ","id":518092,"ico":13,"msg":{"d":"烟墩路10号","r":189,"p":"87669918","n":"10号咖啡厅","ss":40,"m":"http://i2.dpfile.com/2008-11-29/1240333_m.jpg","i":12}},{"poi":"IJJAIHZUACHUTE","id":1923463,"ico":14,"msg":{"d":"建设六马路10号大院2楼","r":31,"p":"83827821","n":"bEnsHoP(建设六马路店)","ss":40,"m":"http://i3.dpfile.com/2011-05-26/8026853_m.jpg","i":16}},{"poi":"IJIJSAZUABUFWM","id":2904928,"ico":15,"msg":{"d":"连新路11号","r":94,"p":"83372146","n":"永驻啡式概念馆","ss":30,"m":"http://i3.dpfile.com/2009-11-15/3147812_m.jpg","i":164}}]
alert(a[1].id);
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//下个Newtonsoft.Json.dll
string str = File.ReadAllText(@"E:\1.txt", Encoding.GetEncoding("gb2312"));//换成你的字符串
JavaScriptArray array = JavaScriptConvert.DeserializeObject(str) as JavaScriptArray;
foreach (JavaScriptObject obj in array)
{
Response.Write(obj["id"] + "<br/>");
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/*
5170931
517031
5170927
2089369
4565789
2117332
1945339
3033721
4517373
4110496
4124015
2685946
518092
1923463
2904928
*/
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Regex regex = new Regex(@"(?i)(?<=""id"":)\d+(?=,)"); //用正则匹配id
MatchCollection matches = regex.Matches(input);
Response.Write("总数:" + matches.Count + "<br />");
foreach (Match item in matches)
{
Response.Write(item.Value + ",");
}
/*
总数:15
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*/
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alert(a[i]["id"])
}