HOw to replace string using regular expression

public static Regex regex = new Regex(
      "(?<Words>[\\w\\s]+)(?<Term>,|$)",
    RegexOptions.IgnoreCase
    | RegexOptions.Multiline
    | RegexOptions.CultureInvariant
    | RegexOptions.IgnorePatternWhitespace
    | RegexOptions.Compiled
    );


public static string regexReplace =
      "team${Term}";

string words="samuel king,rani queen,sastry poet";
string result = regex.Replace(words,regexReplace);