Unused code samples about samples HOT 2 CLOSED

void Main()
{
    // Get .vb files in my local fork of samples.
    // Replacing \ with (\\|\/) is used later for regex, so it matches both \ and /
    var vbSamples = Directory.GetFiles(@"D:\dotnet\samples\samples\", "*.vb", SearchOption.AllDirectories)
                    .Select(s => s.Replace(@"D:\dotnet\samples\samples\", "").Replace(@"\", @"(\\|\/)").ToLower()).ToArray();

    // Get .md files in my local fork of docs.
    var docsMarkdown = Directory.GetFiles(@"D:\dotnet\docs\docs\", "*.md", SearchOption.AllDirectories).ToArray();

    // Get .md files in my local fork of dotnet-api-docs.
    var apiDocsMarkdown = Directory.GetFiles(@"D:\dotnet\dotnet-api-docs\dotnet-api-docs\", "*.md", SearchOption.AllDirectories).ToArray();

    // Get .xml files in my local fork of dotnet-api-docs.
    var apiDocsXml = Directory.GetFiles(@"D:\dotnet\dotnet-api-docs\dotnet-api-docs\", "*.xml", SearchOption.AllDirectories).ToArray();
    
    // Iterate on each vbSample to check if it is used or not.
    for (var i = 0; i < vbSamples.Length; i++)
    {
        // Initially, mark it as unused.
        var isUsedSample = false;

         // If a reference to the sample is found in any file, mark sample as used and break loop.
        foreach (var mdFile in docsMarkdown)
        {
            if (System.Text.RegularExpressions.Regex.IsMatch(File.ReadAllText(mdFile).ToLower(), vbSamples[i]))
            {
                isUsedSample = true;
                goto end_checking;
            }
        }
        
        foreach (var mdFile    in apiDocsMarkdown)
        {
            if (System.Text.RegularExpressions.Regex.IsMatch(File.ReadAllText(mdFile).ToLower(), vbSamples[i]))
            {
                isUsedSample = true;
                goto end_checking;
            }
        }
        
        foreach (var xmlFile in apiDocsXml)
        {
            if (System.Text.RegularExpressions.Regex.IsMatch(File.ReadAllText(xmlFile).ToLower(), vbSamples[i]))
            {
                isUsedSample = true;
                goto end_checking;
            }
        }
        
        
end_checking:
        
        if (!isUsedSample) Console.WriteLine(vbSamples[i]);
        // Write the unused samples to the console.
        Console.WriteLine($"{i + 1} / {vbSamples.Length}");
    }
}