How to replace five digits from a string?

Question

How to replace five digits from a string? Possibly a solution in Regexes, my regular expression skills are not so strong.

string ort = "42671 VÄSTRA FRÖLUNDA"; 

Answer 1

\d{5} will match five digits anywhere in a string. This can be used with Regex.Replace.

Answer 2

    String result = Regex.Replace("input string",@"\d{5}",ReplaceFiveDigits);

    private static string ReplaceFiveDigits(Match m)
    {
        return "VALUE TO REPLACE";
    }

Answer 3

var replaced = Regex.Replace(ort, @"\d{5}", "REPLACE WITH THIS");

will replace any 5 consecutive digits.

do you also want to remove the space afterwards?

var replaced = Regex.Replace(ort, @"\d{5}\s?", "REPLACE WITH THIS");