Parse phone number

I have a string with a phone number. I want to parse the phone number. I tried this and I can't get to the numbers. How can I do this?

  string dastoor =
                "Dear Dr. Lewis: I am referring Margaret xyz (DOB 2/26/yyyy (74 y.o.)) to you for evaluation of PC HAZE OS- AG.The following is a summary of my findings on 7 / 16 / 2014. Patient Home Phone: (222)333-4444 ";

            string dastoorSentenceHomePhone = string.Empty;
            try
            {
               var dastoorTobSearched = "Patient Home Phone:".ToLower();
               var dastoorSentence = dastoor.Substring(dastoor.IndexOf(dastoorTobSearched) + dastoorTobSearched.Length).Trim().ToLower();
               var closingDastoorComma = dastoorSentence.IndexOf(": (");
                dastoorSentenceHomePhone = dastoorSentence.Substring(0, closingDastoorComma).Trim();

                Regex tonumbers = new Regex(@"[^\d]");
                // var  stripped_phonenumber = tonumbers.Replace(dastoorSentenceHomePhone, "");
                //if (stripped_phonenumber != string.Empty)
                //{
                //    string phone2zip = stripped_phonenumber.Substring(0, 3);
                //    string phone2FirstPart = stripped_phonenumber.Substring(3, 3);
                //    string phone2SecondPart = stripped_phonenumber.Substring(6, 4);
                //}
            }
            catch (Exception)
            {

          
            }

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