static void Main(string[] args)
{
// Create Bytescout.PDFExtractor.TextExtractor instance
TextExtractor extractor = new TextExtractor();
extractor.RegistrationName = "demo";
extractor.RegistrationKey = "demo";
// Load sample PDF document
extractor.LoadDocumentFromFile(@".\DocumentWithWatermark.pdf");
// Filter text using text filter
extractor.AddFilter(@"^COPY$", caseSensitive: true, useRegex: true);
// Filter text using appearance filter
// extractor.AddFilter("Arial", fontSize: 203, exclude: true);
// Save extracted text to file
extractor.SaveTextToFile(@".\result.txt");
// Cleanup
extractor.Dispose();
// Open result file in default associated application
ProcessStartInfo processStartInfo = new ProcessStartInfo(@".\result.txt");
processStartInfo.UseShellExecute = true;
Process.Start(processStartInfo);
}