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string s = @"d:\ttt1\cabc2\test3\tets4";
Console.WriteLine(Regex.Replace(s, @"(.*?)\\([^\\]*)\\([^\\]*)$", "$1\\NewContent\\$3"));
string s1 = @"d:\ttt1\cabc2\test3\tets4\tets5";
Console.WriteLine(Regex.Replace(s1, @"(.*?)\\([^\\]*)\\([^\\]*)$", "$1\\NewContent\\$3"));
d:\ttt1\cabc2\NewContent\tets4
d:\ttt1\cabc2\test3\NewContent\tets5