using System;

using System.Text.RegularExpressions;

​

public class Program

{

    public static void Main()

    {

        String example = "call Madhu on 25/02/2112";

            Regex rx = new Regex(@"(?<day>\d{2})\/(?<month>\d{2})\/(?<year>\d{4})(?:[\D]*)");

            Regex rx1 = new Regex(@"(?<day>\d{2})\/(?<month>\d{2})\/(?<year>\d{2})(?:[\D]*)");

            Match m = rx.Match(example);

            Match m1 = rx1.Match(example);

            if (m.Success)

            {

                DateTime date = DateTime.Parse(String.Format("{0}/{1}/{2}", 

                    m.Groups["month"].Value,

                    m.Groups["day"].Value,

                    m.Groups["year"].Value));

                Console.WriteLine(date);

            }

            else if (m1.Success)

            {

                DateTime date = DateTime.Parse(String.Format("{0}/{1}/{2}", 

                    m1.Groups["month"].Value,

                    m1.Groups["day"].Value,

                    m1.Groups["year"].Value));

                Console.WriteLine(date);

            }

        else

        {

            Console.WriteLine("No Date Found");

        }

    }

}