using System;

using System.Collections.Generic;

using System.Linq;

using System.Collections.Specialized;

using System.Configuration;

using System.Data;

using System.Data.SqlClient;

using System.Globalization;

using System.Reflection;

using System.Linq.Expressions;

using System.Net;

using System.Text;

using System.Threading.Tasks;

​

using System.Diagnostics;

​

using System.Text.RegularExpressions;               

public class Program

{

    public static void Main()

    {

         Regex reg = new Regex("{(\\w+)}");     

            var text = "Hello this is a {Testvar}... and we have more {Tagvar} in this string {Endvar}.";

            string[] tagResult = reg.Matches(text)

                .Cast<Match>()

                .Select(match => match.Groups[1].Value).ToArray();

            foreach (var item in tagResult)

            {

                Console.WriteLine(item);

            }

    }

}