How can I read a file that format is like this C#

"r\0\0\0�\0\0\0\0+\u0001\u0001\0\0\0\0\0\u0002 \b\u0004\0\0\0\0\u0001\0\u0001\0\0\0\0\0@\0\0\u0004\0\0(e�\u0012\b\f\0\0\0\u0002\0\u0001\0l\0\0\0@\0\0\0X\0\0\0�\0\0\0\v\u0002\0\0�\0\0\0�\0\0\0\u0001\u0005\0\0�\0\0\0�\0\0\0\0\0�?\0\0�?\0\0�?\0\0�?tools\0lightgrid_volume\0lightgrid_volume\0colorMap\0normalMap\0$identitynormalmap\0colorTint\0"

public void findmaterialname()
{
    Regex regex = new Regex(@"(.+)(tools)(\\[0-9a-z_]+\\)([0-9A-Z_a-z]+)", RegexOptions.Singleline);
    // (.+)(tools)(\\[0-9a-z_]+\\)([0-9A-Z_a-z]+) selects all stuff to tools then is meant to get the other lines but refues
    // ([a-z_0-9]+_c\s)(colorMap) ment to select the path and then link with colour map
    // output should be 0lightgrid_volume\0colorMap  use grop 3 for this colour map refence
    using (StreamReader reader = new StreamReader(@"F:\world_at_war_with_nuketown\Call of Duty - World at War\raw\materials\" + mattofind))
    {
        string line;
        while ((line = reader.ReadToEnd())!= "")
        {
            // Try to match each line against the Regex.
            Match match = regex.Match(line);
            if (match.Success)
            {
                // Write original line and the value.
                string v = match.Groups[4].Value;
                MessageBox.Show(v);
            }
        }
    }
}