using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        var texto = 

            "55(11)97387-0245\r\n" + 

            "55(11)7387-0245\r\n" +

            "ORGANIZAÇÕES LTDA\r\n" +

            "55(11)99678-3199\r\n" +

            "55(11)97100-0445\r\n" +

            "MARIA JOSÉ DA SILVA";

        Regex rgx = new Regex("\\(..\\)[0-9]{3,5}-[0-9]{4}");

        var total = rgx.Matches(texto).Count;

        Console.WriteLine(total);

    }

}