DB dbA = new DB();
dbA.Id = 0;
db.ParentId = null;
DB dbB = new DB();
dbB.Id = 1;
dbB.ParentId = 0;
DB dbC = new DB();
dbC.Id = 2;
dbC.ParentId = 0;
DB dbD = new DB();
dbD.Id = 3;
dbD.ParentId = 2;dbA (id=0)
|---dbB (id=1)
|---dbC (id=2)
|---dbD (id=3)Match match = Regex.Match("https://vk.com/wall-307584833_1982089?reply=3438479", @"wall\-(\d+)_\d+\?reply\=(\d+)",
RegexOptions.IgnoreCase);
if (match.Success)
{
string wallId= match.Groups[1].Value;
string replyId= match.Groups[2].Value;
}