GroupDocs.Redaction for .NET 25.3 Release Notes

// The following example demonstrates how to use custom redaction, including AI-powered redactions.  
// You can provide a custom redaction handler to control the processing of each text segment in the document.  
// Currently, this feature is only supported for PDFs. 

            // Use a regular expression to process the entire text within a custom handler.
            Regex regex = new Regex(".*");

            // Define replacement options.
            ReplacementOptions optionsText = new ReplacementOptions("[replaced]");
            // Set up the custom redaction handler.
            optionsText.CustomRedaction = new TextRedactor();

            var textRedaction = new PageAreaRedaction(regex, optionsText);
            var redactions = new Redaction[] { textRedaction };

            // Currently, custom redaction is supported only for PDFs
            using (Redactor redactor = new Redactor("sample.pdf"))
            {
                RedactorChangeLog result = redactor.Apply(redactions);
                if (result.Status != RedactionStatus.Failed)
                {
                    redactor.Save(new Options.SaveOptions(false, "Custom_Redaction_Result"));
                    Console.WriteLine("Custom redaction performed");
                }
                else
                {
                    Console.WriteLine("Custom redaction failed");
                }
            }
 
            // Implement a custom redaction handler.
            public class TextRedactor : ICustomRedactionHandler
            {
                public CustomRedactionResult Redact(CustomRedactionContext context)
                {
                    CustomRedactionResult result = new CustomRedactionResult();

                    try
                    {
                        // Use built-in tools
                        Regex regex = new Regex(@"Lorem ipsum");
                        if (regex.IsMatch(context.Text))
                        {
                            string redactedText = regex.Replace(context.Text, "[redacted-custom]");
                            result.Apply = true;
                            result.Text = redactedText;
                        }

                        // Or implement your own solution using AI tools 
                        //.....
                    }
                    catch (System.Exception ex)
                    {
                        result.Apply = false;
                    }
                    return result;
                }
            }