C# parsing a text file and storing the values in an array

Question

I am trying to read in a text file which has this format below, into an array:

Previous errors were for Test id \'1234567\' Error id \'12345678\'
Previous errors         


        

Answer 1

Use Regex.Split() if you want the text use

string pattern = @"\d+";

if you want the numbers use:

pattern = "[a-z]+";

then

string[] extracted = Regex.Split(sr.Readline(), pattern, RegexOptions.IgnoreCase);

Answer 2

Since you already have an array with all the lines of text in, you could just iterate over them, and read out the numbers from each.

One such solution:

// Extention method to simplify:
public static string GetNumbersFromPos(this string line, int nrToSkip)
{
    return new string(line.Skip(nrToSkip)
                            .TakeWhile(c => Char.IsNumber(c))
                            .ToArray());
}

// Assume you get this from your array:
var eachLine = "Previous errors were for Test id '1234567' Error id '12345678'";

// Find nr of chars to skip
var beforeFirstId = eachLine.IndexOf("id '") + 4;
var beforeSecondId = eachLine.IndexOf("id '", beforeFirstId) + 4;

// Now use the extention method to get the two number-strings:
var firstId = eachLine.GetNumbersFromPos(beforeFirstId);
var secondId = eachLine.GetNumbersFromPos(beforeSecondId);

This will give you the numbers as strings in firstId and secondId, which you can then store, or parse to int, or whatever you need.

Answer 3

A very basic solution is read the lines, split them and find valid integers:

List<int> test = new List<int>();
List<int> error = new List<int>();

using (var reader = new StreamReader(@"D:\Temp\AccessEmail.txt")){
     string line;
     while ((line = reader.ReadLine()) != null){   
        //split the line
        string[] parts = line.Split(new[]{"Error"}, StringSplitOptions.None);

        //get valid integers
        test.Add(GetInt(parts[0].Split(' ', '\'')));
        error.Add(GetInt(parts[1].Split(' ', '\'')));
     }
}

//print the number of elements in the lists
Console.WriteLine(test.Count); 
Console.WriteLine(error.Count);

---

int GetInt(string[] a){
    int i = 0;

    foreach (string s in a)
       int.TryParse(s, out i);

    return i;
}