using System;

using static System.Console;

using System.Linq;

using System.Text;

using System.Text.RegularExpressions;

using System.Diagnostics;

​

public class Program {

    public static void Main() {

        const int times = 1000;

        string texto;

        var lista = "RUASANTA HELENA, 769  AP 51 BL H JD ALVORADA~ 17513322 ";

        var sw = new Stopwatch();

        WriteLine($"RegEx: {(Regex.Replace(lista, @"(\d+) ", "$1~ "))}");

        sw.Start();

        for (int i = 0; i < times; i++) texto = Regex.Replace(lista, @"(\d+) ", "$1~ ");

        sw.Stop();

        var timer1 = sw.ElapsedTicks;

        WriteLine($"SB:    {(MudaEndereco(lista))}");

        sw.Restart();

        for (int i = 0; i < times; i++) texto = MudaEndereco(lista);

        sw.Stop();

        var timer2 = sw.ElapsedTicks;

        WriteLine($"SB2:   {(MudaEndereco2(lista, (c) => char.IsDigit(c), (c) => char.IsWhiteSpace(c)))}");

        sw.Restart();

        for (int i = 0; i < times; i++) texto = MudaEndereco2(lista, (c) => char.IsDigit(c), (c) => char.IsWhiteSpace(c));

        sw.Stop();

        var timer3 = sw.ElapsedTicks;

        var factor = Min(timer1, timer2, timer3);

        WriteLine($"RegEx: {(double)timer1 / factor, 6:0.000} ({TimeSpan.FromTicks(timer1).ToString((@"ss\:fff"))}) {timer1 / times, 3} Ticks cada");

        WriteLine($"SB:    {(double)timer2 / factor, 6:0.000} ({TimeSpan.FromTicks(timer2).ToString((@"ss\:fff"))}) {timer2 / times, 3} Ticks cada");

        WriteLine($"SB2:   {(double)timer3 / factor, 6:0.000} ({TimeSpan.FromTicks(timer3).ToString((@"ss\:fff"))}) {timer3 / times, 3} Ticks cada");

    }

    public static string MudaEndereco(string texto, char adicao = '~') {

        var resultado = new StringBuilder(texto.Length * 2);

        var anterior = '\0';

        foreach (var caractere in texto) {

            if (Char.IsDigit(anterior) && Char.IsWhiteSpace(caractere)) resultado.Append(adicao);

            resultado.Append(caractere);

            anterior = caractere;

        }

        return resultado.ToString();

    }

    public static string MudaEndereco2(string texto, Func<char, bool> sequencia, Func<char, bool> terminador, char adicao = '~') {

        var resultado = new StringBuilder(texto.Length * 2);

        var anterior = '\0';

        foreach (var caractere in texto) {

            if (sequencia(anterior) && terminador(caractere)) resultado.Append(adicao);

            resultado.Append(caractere);

            anterior = caractere;

        }

        return resultado.ToString();

    }

    public static T Min<T>(params T[] numbers) => numbers.Min();

}