System.Text.RegularExpressions.Regex.GroupNumberFromName C# (CSharp) Method

        public int GroupNumberFromName(string name)
        {
            throw null;
        }

 internal RegExpMatch(ArrayPrototype parent, Regex regex, Match match, string input) : base(parent, typeof(RegExpMatch))
 {
     this.hydrated = false;
     this.regex = regex;
     this.matches = null;
     this.match = match;
     base.SetMemberValue("input", input);
     base.SetMemberValue("index", match.Index);
     base.SetMemberValue("lastIndex", (match.Length == 0) ? (match.Index + 1) : (match.Index + match.Length));
     string[] groupNames = regex.GetGroupNames();
     int num = 0;
     for (int i = 1; i < groupNames.Length; i++)
     {
         string name = groupNames[i];
         int num3 = regex.GroupNumberFromName(name);
         if (name.Equals(num3.ToString(CultureInfo.InvariantCulture)))
         {
             if (num3 > num)
             {
                 num = num3;
             }
         }
         else
         {
             Group group = match.Groups[name];
             base.SetMemberValue(name, group.Success ? group.ToString() : null);
         }
     }
     this.length = num + 1;
 }