Environment: asp.net c# openxml

Ok, so I've been reading a ton of snippets and trying to recreate the wheel, but I'm hoping that somone can help me get to my desination faster. I have multiple documents that I need to merge together... check... I'm able to do that with openxml sdk. Birds are singing, sun is shining so far. Now that I have the document the way I want it, I need to search and replace text and/or content controls.

I've tried using my own text - {replace this} but when I look at the xml (rename docx to zip and view the file), the { is nowhere near the text. So I either need to know how to protect that within the doucment so they don't diverge or I need to find another way to search and replace.

I'm able to search/replace if it is an xml file, but then I'm back to not being able to combine the doucments easily.

Code below... and as I mentioned... document merge works fine... just need to replace stuff.

    protected void exeProcessTheDoc(object sender, EventArgs e)
    {
        string doc1 = Server.MapPath("~/Templates/doc1.docx");
        string doc2 = Server.MapPath("~/Templates/doc2.docx");
        string final_doc = Server.MapPath("~/Templates/extFinal.docx");

        File.Delete(final_doc);
        File.Copy(doc1, final_doc);

        using (WordprocessingDocument myDoc = WordprocessingDocument.Open(final_doc, true))
        {
            string altChunkId = "AltChunkId2";

            MainDocumentPart mainPart = myDoc.MainDocumentPart;
            AlternativeFormatImportPart chunk = mainPart.AddAlternativeFormatImportPart(
            AlternativeFormatImportPartType.WordprocessingML, altChunkId);
            using (FileStream fileStream = File.Open(doc2, FileMode.Open))
            chunk.FeedData(fileStream);
            AltChunk altChunk = new AltChunk();
            altChunk.Id = altChunkId;
            mainPart.Document.Body.InsertAfter(altChunk, mainPart.Document.Body.Elements<Paragraph>().Last());
            mainPart.Document.Save();
        }
        exeSearchReplace(final_doc);
    }

    protected void exeSearchReplace(string document)
    {
        using (WordprocessingDocument wordDoc = WordprocessingDocument.Open(document, true))
        {
            string docText = null;
            using (StreamReader sr = new StreamReader(wordDoc.MainDocumentPart. GetStream()))
            {
                docText = sr.ReadToEnd();
            }

            Regex regexText = new Regex("acvtClientName");
            docText = regexText.Replace(docText, "Hi Everyone!");

            using (StreamWriter sw = new StreamWriter(wordDoc.MainDocumentPart.GetStream(FileMode.Create)))
            {
                sw.Write(docText);
            }
        }
    }
}

}