using System;

using System.Text.RegularExpressions;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var propostaComTranslate = "teste1 01/03/1992 - teste2 01/03/1992 - teste3 01/03/1992";

        propostaComTranslate = Regex.Replace(propostaComTranslate, @"[0-9]{2}\/[0-9]{2}\/[0-9]{4}", delegate(Match m)

        {

            var dataSplit = m.Value.Split('/').ToArray();

            var dataStr = new DateTime(Convert.ToInt32(dataSplit[2]), Convert.ToInt32(dataSplit[1]), Convert.ToInt32(dataSplit[0])).ToShortDateString();

            return dataStr;

        });

        Console.WriteLine(propostaComTranslate);

    }

}