string s = @"[{""time"":""Time(2014,1,1)"",""value"":""25""},{""time"":""Time(2014,1,2)"",""value"":""29""},
{""time"":""Time(2014,3,1)"",""value"":""26""},{""time"":""Time(2014,3,5)"",""value"":""15""}]";
MatchCollection matches = Regex.Matches(s, @"{""time"":""([^""]*?)"",""value"":""([^""]*?)""}");
Match match = matches[matches.Count - 1];
Console.WriteLine(match.Groups[1].Value + ":" + match.Groups[2].Value);
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