using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        String text = "teste {variavel} teste {value}";

        Regex r = new Regex(@"(?<=\{)[^\}]+?(?=\})");

        MatchCollection m = r.Matches(text);

        foreach(Match n in m){

            Console.Write(n+"\n");

        }

    }

}