How can I put a Console Write Command to String [closed]

Maybe this question is silly, but I hope someone can help me out. I'm trying to get the output of this command to a string.

 for (int i = 48; i < 123; i++)
 {
    int keyState = GetAsyncKeyState(i);

    if (keyState == 32769)
    {
       Console.Write((char)i);
    }
 }

The plan behind this is to get the string and do a regex. The regex should check the string and if the regex matches with the string it should execute a command.

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