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if (!IsPostBack) {
Regex r=new Regex(@"(?<=\d)(?<!\.\d*)(?=(?:\d{3})+(?:\.\d+|$))");
string a = "1234567890";
Response.Write(r.Replace(a,","));
}
var replaceExp=new RegExp('(?<=\\d)(?<!\\.\\d*)(?=(?:\\d{3})+(?:\\.\\d+|$))');