string SearchPattern = "[Ww]ord[Ww]riter";
        string replaceWith = "SoftArtisans";
        string docPath = @"..\..\WordTemplateFiles\SearchReplace.doc";

        /// <summary>
        /// Searches a document for a Regular Expression search term
        /// and replaces all instances of that term with a new string.
        /// The revised document is then saved.
        /// </summary>
        public void SearchDocument()
        {
            /// Open the document you wish to search

            WordApplication wordApp = new WordApplication();
            Document doc = wordApp.Open(docPath);

            // Execute the replacement by specifying the search term
            // as a Regular Expression string, and the replacement string.
            // SearchAndReplace will return the number of replacements made.

            int numReplacements = doc.SearchAndReplace(SearchPattern, replaceWith);

            // If no occurrences of the search pattern were found in the doc, display
            // a message and return.

            if(numReplacements == 0)
            {
                Console.WriteLine("Note: No occurrences of \"{0}\" were found in the document. " +
                                "Please try another search pattern.", SearchPattern);
                return;
            }

            // Prepend a message to the beginning of the document noting
            // how many replacements were made.
            string text =
                String.Format("Replaced {0} instances of \"{1}\" with \"{2}\"",
                    numReplacements, SearchPattern, replaceWith);

            // Create a new paragraph and insert the note
            Paragraph pg = doc.InsertParagraphBefore(null);
            pg.InsertTextAfter(text, false);

            // Save the edited document
            wordApp.Save(doc, @"..\..\WordOutputFiles\Replaced_out.doc");
        }
    }