How to use named groups when performing a Regex.Replace()

Question

How do I use named captures when performing Regex.Replace? I have gotten this far and it does what I want but not in the way I want it:

[TestCase(\"First Sec         


        

Answer 1

Simply replace with ${groupName}

[TestCase("First Second", "Second First")]
public void NumberedReplaceTest(string input, string expected)
{
    Regex regex = new Regex("(?First) (?Second)");
    Assert.IsTrue(regex.IsMatch(input));
    string replace = regex.Replace(input, "${secondMatch} ${firstMatch}");
    Assert.AreEqual(expected, replace);
}