ConvertTextTable

using System;
using System.Text;
using System.Text.RegularExpressions;
using System.IO;

namespace ConvertTextTable
{
  /// <summary>
  /// Converting text-like tables to proper CSV format.
  /// </summary>
  class ConvertTextTableProcedure
  {
    /// <summary>
    /// Path of the source file.
    /// </summary>
    const string sourceFilePath = @"C:\Data\MyTable.txt";

    /// <summary>
    /// Path of the destination file.
    /// </summary>
    const string destinationFilePath = @"C:\Data\Table.csv";

    /// <summary>
    /// Main function of application.
    /// </summary>
    /// <param name="args">Array of input parameters.</param>
    static void Main(string[] args)
    {
      var file = File.ReadAllText(sourceFilePath);
      var searchPattern = @"[A-Za-z0-9/]+(\s|\.)+([a-záéíóöőúüű]+\s+)+([0-9]*\s*)[0-9]+(\.)[0-9]+(\s+)[0-9]+(\.)[0-9]+"
                           + @"(\s+)([a-záéíóöőúüű]+\s+)*(---|___)";
      var dataLine = Regex.Match(file, searchPattern);

      File.WriteAllText(destinationFilePath,
                        (@"identifier; name; first number; second number; third number" + Environment.NewLine));

      while (dataLine.Success)
      {
        var identifier = Regex.Match(dataLine.Value, @"[A-Za-z0-9/]+");
        var startPosition = identifier.Index + identifier.Length;
        var nameFirstPart = Regex.Match(dataLine.Value.Substring(startPosition), @"([a-záéíóöőúüű]+\s+?)+");
        startPosition += nameFirstPart.Index + nameFirstPart.Length;
        var firstNumber = Regex.Match(dataLine.Value.Substring(startPosition), @"\s[0-9]+\s+?");
        startPosition += firstNumber.Index + firstNumber.Length;
        var secondNumber = Regex.Match(dataLine.Value.Substring(startPosition), @"[0-9]+(\.)[0-9]+\s+?");
        startPosition += secondNumber.Index + secondNumber.Length;
        var thirdNumber = Regex.Match(dataLine.Value.Substring(startPosition), @"[0-9]+(\.)[0-9]+\s+?");
        startPosition += thirdNumber.Index + thirdNumber.Length;
        var nameLastPart = Regex.Match(dataLine.Value.Substring(startPosition), @"([a-záéíóöőúüű]+\s)+");
        var name = nameFirstPart.Value + nameLastPart.Value;

        var tableSeparator = @";";
        File.AppendAllText(destinationFilePath,
                           (identifier.Value
                            + tableSeparator
                            + name
                            + tableSeparator
                            + firstNumber.Value
                            + tableSeparator
                            + secondNumber.Value
                            + tableSeparator
                            + thirdNumber.Value
                            + Environment.NewLine),
                           Encoding.UTF8);

        dataLine = dataLine.NextMatch();
      }

      Console.WriteLine("Table conversion has been finished.");
      Console.ReadKey();
    }
  }
}