how to write parameterized regular expression in c#

using System;
using System.Linq;

namespace oops1
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = "A 0 B 1 C 0" + "\n" +
                            "One: 1" + "\n" +
                           " A 0 B 2 C 1" + "\n" +
                            "Two: 2" + "\n" +
                            "A 0 B 3 C 2" + "\n" +
                            "Three: 3";

            string output = GetText(input, 0, 1, 0); //output is -> One: 1

            Console.WriteLine(output);
            Console.ReadLine();

        }

        public static string GetText(string input, int a, int b, int c)
        {
            string format = "A {0} B {1} C {2}";
            var array = input.Split('\n').ToList();
            int index = array.IndexOf(string.Format(format, a, b, c)) + 1;
            return array[index];
        }
    }
}