using System;

using System.Text.RegularExpressions;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var input = "{abc}@{defgh}mner{123}";

        var pattern = @"\{(.+?)\}";

        var matches = Regex.Matches(input, pattern);

        IList<string> output = matches.Cast<Match>().Select(x => x.Groups[0].Value).ToList();

        output.Dump();  

    }

}