Parsing numbers from address

A few months back I created several SQL CLR C# functions for a data cleaning project that I was working on. I've had to revisit the code due to a number of bugs that have been found recently.

One of the bugs is the way my C# code strips house numbers from addresses.

The function that I use is below. It works really well for most cases, for example:

Hans-böckler-ring 23A I get 23A

but Hans-böckler-ring 23 A I get 23

How do I make it so that if there is a space and the next character is not a word then pull the number and the chacater? Any ideas?

    public static string GetDigits(string theWord)
        {
            if (String.IsNullOrEmpty(theWord)) { theWord = ""; }
            string newWord = "";

            char[] KeepArray = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '\\', '/', '-', ' ' };
            foreach (char thischar in theWord)
            {
                if (KeepArray.Contains(thischar))
                {
                    newWord += thischar;
                }
                else if (Char.IsLetter(thischar) && newWord.Length > 0)
                {

                    try
                    {
                        if (Char.IsDigit((Convert.ToChar(newWord.Substring(newWord.Length - 1, 1)))))
                        {
                            newWord += thischar;
                        }
                    }
                    catch
                    {
                    }
                }
            }
            newWord = newWord.Replace(" ", " |").Replace("| ", "").Replace("|", "");
            return newWord.Trim();
        }

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