Removing word or character from string followed by space or before space in c#

Question

I have a string

string name = \"AL QADEER UR AL REHMAN AL KHALIL UN\";

How would I remove all characters AL, UR,

Answer 1

I am loading that list from database, and can be change any time, how do use this in regex when changes occur

okay then, the length would always be 2?

no, but not be greater than 4

public static void Main()
{
    var input = "AL QADEER UR AL REHMAN AL KHALIL UN AAA BBB";
    Regex re = new Regex(@"\b\w{1,4}\b");
    var result = re.Replace(input, "");
    Console.WriteLine(result);
}

OUTPUT:

QADEER REHMAN KHALIL

dotNetFiddle