Question

Im’ looking for a Regex pattern that finds a house letter.

Eks(looking for the letter d).

1. Streetname 3d, 7000 Town Country. 
2. Streetname 3 d, 7000 Town Country. 
3. Streetname 13d, 7000 Town Country. 
4. Streetname 13 d, 7000 Town Country. 

I’m writing i C#.

Answer 1

I think this pattern works in your 4 cases.
I don’t test the code but just try it and tell me.

string sPattern = "[a-zA-Z 0-9]*([a-zA-Z]),.*";
int i = 0;
foreach (string s in address)
{
     Match m = Regex.Match(s, sPattern);
     if (m.Success){
         houseLetter[i] = m.ToString(); 
     } else {
         houseLetter[i] = "Not Found";
     }
     i++;
}