diff --git a/QWERTYkez.WordProcessor/DynamicReplaceExt.cs b/QWERTYkez.WordProcessor/DynamicReplaceExt.cs
new file mode 100644
index 0000000..04cd231
--- /dev/null
+++ b/QWERTYkez.WordProcessor/DynamicReplaceExt.cs
@@ -0,0 +1,256 @@
+namespace QWERTYkez.WordProcessor;
+
+internal static class DynamicReplaceExt
+{
+    // ============================================================
+    // Разбор шаблона вида "$key|$" на prefix="$key|" и suffix="$"
+    // Параметр помещается между prefix и suffix.
+    // ============================================================
+    internal static void ParsePattern(string oldValue, out string prefix, out string suffix)
+    {
+        if (string.IsNullOrEmpty(oldValue))
+            throw new ArgumentException("Old value cannot be null or empty", nameof(oldValue));
+
+        int lastPipe = oldValue.LastIndexOf('|');
+        if (lastPipe < 0)
+            throw new ArgumentException("Dynamic pattern must contain '|' separator", nameof(oldValue));
+
+        prefix = oldValue.Substring(0, lastPipe + 1);
+        suffix = oldValue.Substring(lastPipe + 1);
+    }
+
+    internal readonly struct MatchInfo(int start, int end, string param)
+    {
+        public readonly int Start = start;
+        public readonly int End = end;
+        public readonly string Param = param;
+    }
+
+    // ============================================================
+    // Поиск всех вхождений prefix + <param> + suffix в тексте.
+    // Возвращает список в порядке возрастания позиции.
+    // ============================================================
+    internal static List<MatchInfo> FindMatches(
+        string text,
+        string prefix,
+        string suffix,
+        StringComparison comparisonType)
+    {
+        var result = new List<MatchInfo>();
+        if (string.IsNullOrEmpty(text) || string.IsNullOrEmpty(prefix))
+            return result;
+
+        int searchPos = 0;
+        while (searchPos < text.Length)
+        {
+            int pStart = text.IndexOf(prefix, searchPos, comparisonType);
+            if (pStart < 0) break;
+
+            int paramStart = pStart + prefix.Length;
+            int pEnd;
+            if (string.IsNullOrEmpty(suffix))
+            {
+                pEnd = text.Length;
+            }
+            else
+            {
+                pEnd = text.IndexOf(suffix, paramStart, comparisonType);
+                if (pEnd < 0) break;
+            }
+
+            string param = text.Substring(paramStart, pEnd - paramStart);
+            int matchEnd = pEnd + suffix.Length;
+            result.Add(new MatchInfo(pStart, matchEnd, param));
+
+            // следующий поиск — после окончания текущего совпадения
+            searchPos = matchEnd;
+            if (searchPos <= pStart) searchPos = pStart + 1; // защита от зацикливания
+        }
+        return result;
+    }
+
+    // ============================================================
+    // REPLACE STRING  (Func<string,string>)
+    // ============================================================
+
+    internal static void ReplaceStringInBody(
+        Body body, string oldValue, Func<string, string> factory, StringComparison comparisonType)
+    {
+        if (body is null || factory is null) return;
+        ParsePattern(oldValue, out var prefix, out var suffix);
+
+        var paragraphs = body.Elements<Paragraph>().ToList();
+        for (int i = paragraphs.Count - 1; i >= 0; i--)
+        {
+            paragraphs[i].SimpleReplaceDynamic(prefix, suffix, factory, comparisonType);
+        }
+    }
+
+    internal static void ReplaceStringInTables(
+        OpenXmlElement element, string oldValue, Func<string, string> factory, StringComparison comparisonType)
+    {
+        if (element is null || factory is null) return;
+        ParsePattern(oldValue, out var prefix, out var suffix);
+
+        foreach (var table in TableTextProcessor.GetAllTables(element))
+        {
+            var paragraphs = TableTextProcessor.GetTableParagraphs(table).ToList();
+            for (int i = paragraphs.Count - 1; i >= 0; i--)
+            {
+                paragraphs[i].SimpleReplaceDynamic(prefix, suffix, factory, comparisonType);
+            }
+        }
+    }
+
+    internal static void ReplaceStringInHeadersFooters(
+        WordprocessingDocument doc, string oldValue, Func<string, string> factory, StringComparison comparisonType)
+    {
+        if (doc is null || factory is null) return;
+        ParsePattern(oldValue, out var prefix, out var suffix);
+
+        foreach (var header in HeaderFooterProcessor.GetAllHeaders(doc))
+            ReplaceStringInElement(header, prefix, suffix, factory, comparisonType);
+
+        foreach (var footer in HeaderFooterProcessor.GetAllFooters(doc))
+            ReplaceStringInElement(footer, prefix, suffix, factory, comparisonType);
+    }
+
+    private static void ReplaceStringInElement(
+        OpenXmlElement element, string prefix, string suffix,
+        Func<string, string> factory, StringComparison comparisonType)
+    {
+        var paragraphs = element.Descendants<Paragraph>().ToList();
+        var tables = TableTextProcessor.GetAllTables(element).ToList();
+        var tableParagraphs = tables.SelectMany(t => TableTextProcessor.GetTableParagraphs(t)).ToList();
+
+        var allParagraphs = paragraphs.Concat(tableParagraphs).Distinct().ToList();
+        for (int i = allParagraphs.Count - 1; i >= 0; i--)
+        {
+            allParagraphs[i].SimpleReplaceDynamic(prefix, suffix, factory, comparisonType);
+        }
+    }
+
+    internal static bool SimpleReplaceDynamic(
+        this Paragraph? paragraph,
+        string prefix,
+        string suffix,
+        Func<string, string> factory,
+        StringComparison comparisonType)
+    {
+        if (paragraph is null || factory is null) return false;
+
+        var text = paragraph.InnerText;
+        if (string.IsNullOrEmpty(text)) return false;
+
+        var matches = FindMatches(text, prefix, suffix, comparisonType);
+        if (matches.Count == 0) return false;
+
+        // Обходим справа налево: правые замены не сдвигают координаты левых.
+        for (int i = matches.Count - 1; i >= 0; i--)
+        {
+            var m = matches[i];
+            string matchedText = text.Substring(m.Start, m.End - m.Start);
+            string replacement = factory(m.Param) ?? string.Empty;
+
+            paragraph.SimpleReplace(matchedText, replacement, comparisonType);
+        }
+        return true;
+    }
+
+    // ============================================================
+    // REPLACE ITEM  (Func<string,ReplaceItem>)
+    // ============================================================
+
+    internal static void ReplaceItemInBody(
+        Body body, string oldValue, Func<string, ReplaceItem> factory, StringComparison comparisonType)
+    {
+        if (body is null || factory is null) return;
+        ParsePattern(oldValue, out var prefix, out var suffix);
+
+        var paragraphs = body.Elements<Paragraph>().ToList();
+        for (int i = paragraphs.Count - 1; i >= 0; i--)
+        {
+            paragraphs[i].SimpleReplaceItemDynamic(prefix, suffix, factory, comparisonType);
+        }
+    }
+
+    internal static void ReplaceItemInTables(
+        OpenXmlElement element, string oldValue, Func<string, ReplaceItem> factory, StringComparison comparisonType)
+    {
+        if (element is null || factory is null) return;
+        ParsePattern(oldValue, out var prefix, out var suffix);
+
+        foreach (var table in TableTextProcessor.GetAllTables(element))
+        {
+            var paragraphs = TableTextProcessor.GetTableParagraphs(table).ToList();
+            for (int i = paragraphs.Count - 1; i >= 0; i--)
+            {
+                paragraphs[i].SimpleReplaceItemDynamic(prefix, suffix, factory, comparisonType);
+            }
+        }
+    }
+
+    internal static void ReplaceItemInHeadersFooters(
+        WordprocessingDocument doc, string oldValue, Func<string, ReplaceItem> factory, StringComparison comparisonType)
+    {
+        if (doc is null || factory is null) return;
+        ParsePattern(oldValue, out var prefix, out var suffix);
+
+        foreach (var header in HeaderFooterProcessor.GetAllHeaders(doc))
+            ReplaceItemInElement(header, prefix, suffix, factory, comparisonType);
+
+        foreach (var footer in HeaderFooterProcessor.GetAllFooters(doc))
+            ReplaceItemInElement(footer, prefix, suffix, factory, comparisonType);
+    }
+
+    private static void ReplaceItemInElement(
+        OpenXmlElement element, string prefix, string suffix,
+        Func<string, ReplaceItem> factory, StringComparison comparisonType)
+    {
+        var paragraphs = element.Descendants<Paragraph>().ToList();
+        var tables = TableTextProcessor.GetAllTables(element).ToList();
+        var tableParagraphs = tables.SelectMany(t => TableTextProcessor.GetTableParagraphs(t)).ToList();
+
+        var allParagraphs = paragraphs.Concat(tableParagraphs).Distinct().ToList();
+        for (int i = allParagraphs.Count - 1; i >= 0; i--)
+        {
+            allParagraphs[i].SimpleReplaceItemDynamic(prefix, suffix, factory, comparisonType);
+        }
+    }
+
+    internal static bool SimpleReplaceItemDynamic(
+        this Paragraph? paragraph,
+        string prefix,
+        string suffix,
+        Func<string, ReplaceItem> factory,
+        StringComparison comparisonType)
+    {
+        if (paragraph is null || factory is null) return false;
+
+        var text = paragraph.InnerText;
+        if (string.IsNullOrEmpty(text)) return false;
+
+        var matches = FindMatches(text, prefix, suffix, comparisonType);
+        if (matches.Count == 0) return false;
+
+        for (int i = matches.Count - 1; i >= 0; i--)
+        {
+            var m = matches[i];
+            string matchedText = text.Substring(m.Start, m.End - m.Start);
+
+            ReplaceItem item = factory(m.Param);
+            if (item is null) continue;
+
+            if (item.BreakValue.HasValue)
+            {
+                // Поддерживаются PageBreak / NewLandscapeSection / NewPortraitSection
+                paragraph.SimpleReplace(matchedText, string.Empty, comparisonType, item.BreakValue.Value);
+            }
+            else
+            {
+                paragraph.SimpleReplace(matchedText, item.Text ?? string.Empty, comparisonType);
+            }
+        }
+        return true;
+    }
+}
\ No newline at end of file
diff --git a/QWERTYkez.WordProcessor/DynamicReplaceToTextExt.cs b/QWERTYkez.WordProcessor/DynamicReplaceToTextExt.cs
new file mode 100644
index 0000000..33cdc84
--- /dev/null
+++ b/QWERTYkez.WordProcessor/DynamicReplaceToTextExt.cs
@@ -0,0 +1,214 @@
+namespace QWERTYkez.WordProcessor;
+
+/// <summary>
+/// Вспомогательный класс для динамической замены параграфов, содержащих "$key|param$",
+/// на текст, построенный через <see cref="IText"/>.
+/// </summary>
+internal static class DynamicReplaceToTextExt
+{
+    internal static void ReplaceParagraphsContainingTextToTextDynamic(
+        Body body,
+        string oldValue,
+        Action<string, IText> buildText)
+    {
+        if (body is null || string.IsNullOrEmpty(oldValue) || buildText is null)
+            return;
+
+        DynamicReplaceExt.ParsePattern(oldValue, out var prefix, out var suffix);
+
+        var paragraphs = body.Elements<Paragraph>().ToList();
+        if (paragraphs.Count == 0)
+            return;
+
+        for (int i = paragraphs.Count - 1; i >= 0; i--)
+        {
+            var paragraph = paragraphs[i];
+            if (paragraph is null) continue;
+
+            var paraText = paragraph.InnerText;
+            if (string.IsNullOrEmpty(paraText)) continue;
+
+            int pStart = paraText.IndexOf(prefix, StringComparison.OrdinalIgnoreCase);
+            if (pStart < 0) continue;
+
+            int paramStart = pStart + prefix.Length;
+            int pEnd = string.IsNullOrEmpty(suffix)
+                ? paraText.Length
+                : paraText.IndexOf(suffix, paramStart, StringComparison.OrdinalIgnoreCase);
+            if (pEnd < 0) continue;
+
+            string param = paraText.Substring(paramStart, pEnd - paramStart);
+            string matchedText = paraText.Substring(pStart, pEnd + suffix.Length - pStart);
+
+            var fontProps = ExtractFontPropsFromParagraph(paragraph, matchedText);
+            var paragraphProps = paragraph.ParagraphProperties?.CloneNode(true) as ParagraphProperties;
+
+            var capturedParam = param;
+            ReplaceWithTextBuilder(paragraph, tb => buildText(capturedParam, tb), fontProps, paragraphProps);
+        }
+    }
+
+    // ------------------------------------------------------------
+    // Ниже — 1:1 копия из ReplaceToTextExt (private helper-методы)
+    // ------------------------------------------------------------
+
+    private static void ReplaceWithTextBuilder(
+        Paragraph paragraph,
+        Action<IText> buildText,
+        FontProps? baseFont,
+        ParagraphProperties? baseParagraphProps)
+    {
+        if (paragraph is null || paragraph.Parent is null || buildText is null)
+            return;
+
+        var parent = paragraph.Parent;
+
+        var builder = TextBuilder.Create(baseFont, baseParagraphProps);
+        buildText(builder);
+        var newParagraphs = builder.Build();
+
+        int paraIndex = -1;
+        var children = parent.ChildElements;
+
+        for (int i = 0; i < children.Count; i++)
+        {
+            if (children[i] == paragraph)
+            {
+                paraIndex = i;
+                break;
+            }
+        }
+
+        if (paraIndex == -1)
+            return;
+
+        parent.RemoveChild(paragraph);
+
+        for (int i = 0; i < newParagraphs.Count; i++)
+        {
+            parent.InsertAt(newParagraphs[i], paraIndex + i);
+        }
+    }
+
+    private static FontProps? ExtractFontPropsFromParagraph(Paragraph paragraph, string searchText)
+    {
+        if (paragraph is null || string.IsNullOrEmpty(searchText))
+            return null;
+
+        var runs = paragraph.Descendants<Run>().ToList();
+        if (runs.Count == 0)
+            return null;
+
+        var runInfos = new List<(Run Run, int Start, int End, string Text)>();
+        int currentPosition = 0;
+
+        foreach (var run in runs)
+        {
+            var runText = GetRunText(run);
+            if (!string.IsNullOrEmpty(runText))
+            {
+                runInfos.Add((run, currentPosition, currentPosition + runText.Length, runText));
+                currentPosition += runText.Length;
+            }
+        }
+
+        foreach (var (run, start, end, text) in runInfos)
+        {
+            if (text.IndexOf(searchText, StringComparison.OrdinalIgnoreCase) >= 0)
+            {
+                return CreateFontPropsFromRun(run);
+            }
+        }
+
+        var fullText = string.Concat(runInfos.Select(r => r.Text));
+        int textIndex = fullText.IndexOf(searchText, StringComparison.OrdinalIgnoreCase);
+
+        if (textIndex >= 0)
+        {
+            var intersectingRun = runInfos.FirstOrDefault(r =>
+                r.Start <= textIndex && r.End > textIndex);
+
+            if (intersectingRun.Run is not null)
+            {
+                return CreateFontPropsFromRun(intersectingRun.Run);
+            }
+        }
+
+        return null;
+    }
+
+    private static FontProps CreateFontPropsFromRun(Run run)
+    {
+        var runProperties = run.RunProperties;
+        if (runProperties is null)
+            return new FontProps();
+
+        var fontProps = new FontProps();
+
+        var runFonts = runProperties.GetFirstChild<RunFonts>();
+        if (runFonts is not null)
+        {
+            fontProps = fontProps with
+            {
+                FontFamily = runFonts.Ascii ?? runFonts.HighAnsi ?? runFonts.ComplexScript
+            };
+        }
+
+        var fontSize = runProperties.GetFirstChild<FontSize>();
+        if (fontSize is not null && !string.IsNullOrEmpty(fontSize.Val) &&
+            uint.TryParse(fontSize.Val, out uint halfPoints))
+        {
+            fontProps = fontProps with { Size = halfPoints / 2.0 };
+        }
+
+        var bold = runProperties.GetFirstChild<Bold>();
+        if (bold is not null)
+        {
+            bool isBold = true;
+            if (bold.Val is not null)
+                isBold = bold.Val.Value;
+            fontProps = fontProps with { IsBold = isBold };
+        }
+
+        var italic = runProperties.GetFirstChild<Italic>();
+        if (italic is not null)
+        {
+            bool isItalic = true;
+            if (italic.Val is not null)
+                isItalic = italic.Val.Value;
+            fontProps = fontProps with { IsItalic = isItalic };
+        }
+
+        var underline = runProperties.GetFirstChild<Underline>();
+        if (underline is not null && underline.Val is not null)
+        {
+            fontProps = fontProps with { Underline = underline.Val.Value };
+        }
+
+        var color = runProperties.GetFirstChild<Color>();
+        if (color is not null && !string.IsNullOrEmpty(color.Val))
+        {
+            fontProps = fontProps with { Color = color.Val };
+        }
+
+        var verticalAlignment = runProperties.GetFirstChild<VerticalTextAlignment>();
+        if (verticalAlignment is not null && verticalAlignment.Val is not null)
+        {
+            fontProps = fontProps with { SubSup = verticalAlignment.Val.Value };
+        }
+
+        return fontProps;
+    }
+
+    private static string GetRunText(Run run)
+    {
+        if (run is null) return string.Empty;
+
+        var sb = new StringBuilder();
+        foreach (var text in run.Elements<Text>())
+        {
+            sb.Append(text.Text ?? string.Empty);
+        }
+        return sb.ToString();
+    }
+}
\ No newline at end of file
diff --git a/QWERTYkez.WordProcessor/WordWriter.cs b/QWERTYkez.WordProcessor/WordWriter.cs
index c12f5de..305aedd 100644
--- a/QWERTYkez.WordProcessor/WordWriter.cs
+++ b/QWERTYkez.WordProcessor/WordWriter.cs
@@ -337,6 +337,135 @@ internal sealed class WordWriter : WordReader, IWordWriter
 
     #endregion
 
+
+
+
+
+
+
+
+
+
+    public void ReplaceString(string oldValue, Func<string, string> newValues)
+    {
+        ThrowIfDisposed();
+
+        if (string.IsNullOrEmpty(oldValue))
+            throw new ArgumentException("Old value cannot be null or empty", nameof(oldValue));
+
+        if (newValues is null) return;
+
+#if DEBUG
+        Debug.WriteLine($"[DEBUG] [WordProcessor.ReplaceString(dynamic)] START: '{oldValue}'");
+#endif
+
+        lock (_syncLock)
+        {
+            // 1. Основной текст
+            DynamicReplaceExt.ReplaceStringInBody(_body, oldValue, newValues, StringComparison.OrdinalIgnoreCase);
+
+            // 2. Таблицы в основном тексте
+            DynamicReplaceExt.ReplaceStringInTables(_body, oldValue, newValues, StringComparison.OrdinalIgnoreCase);
+
+            // 3. Колонтитулы
+            DynamicReplaceExt.ReplaceStringInHeadersFooters(_doc, oldValue, newValues, StringComparison.OrdinalIgnoreCase);
+
+            _isModified = true;
+        }
+    }
+
+    public void ReplaceItem(string oldValue, Func<string, ReplaceItem> newValues)
+    {
+        ThrowIfDisposed();
+
+        if (string.IsNullOrEmpty(oldValue))
+            throw new ArgumentException("Old value cannot be null or empty", nameof(oldValue));
+
+        if (newValues is null) return;
+
+#if DEBUG
+        Debug.WriteLine($"[DEBUG] [WordProcessor.ReplaceItem(dynamic)] START: '{oldValue}'");
+#endif
+
+        lock (_syncLock)
+        {
+            // 1. Основной текст
+            DynamicReplaceExt.ReplaceItemInBody(_body, oldValue, newValues, StringComparison.OrdinalIgnoreCase);
+
+            // 2. Таблицы в основном тексте
+            DynamicReplaceExt.ReplaceItemInTables(_body, oldValue, newValues, StringComparison.OrdinalIgnoreCase);
+
+            // 3. Колонтитулы
+            DynamicReplaceExt.ReplaceItemInHeadersFooters(_doc, oldValue, newValues, StringComparison.OrdinalIgnoreCase);
+
+            _isModified = true;
+        }
+    }
+
+    public void ReplaceToText(string oldValue, Action<string, IText> buildText)
+    {
+        ThrowIfDisposed();
+
+        if (string.IsNullOrEmpty(oldValue))
+            throw new ArgumentException("Old value cannot be null or empty", nameof(oldValue));
+
+        if (buildText is null) return;
+
+#if DEBUG
+        Debug.WriteLine($"[DEBUG] [WordProcessor.ReplaceToText(dynamic)] START: '{oldValue}'");
+#endif
+
+        lock (_syncLock)
+        {
+            DynamicReplaceToTextExt.ReplaceParagraphsContainingTextToTextDynamic(_body, oldValue, buildText);
+            _isModified = true;
+        }
+    }
+
+
+
+
+
+
+
+
+    public void ReplaceString(string oldValue, Func<string, IEnumerable<string>> newValues)
+    {
+        throw new NotImplementedException();
+    }
+
+    public void ReplaceString(string oldValue, Func<string, string[]> newValues)
+    {
+        throw new NotImplementedException();
+    }
+
+    public void ReplaceItem(string oldValue, Func<string, IEnumerable<ReplaceItem>> newValues)
+    {
+        throw new NotImplementedException();
+    }
+
+    public void ReplaceItem(string oldValue, Func<string, ReplaceItem[]> newValues)
+    {
+        throw new NotImplementedException();
+    }
+
+    public void ReplaceToTable(string oldValue, Action<string, ITable> buildTable)
+    {
+        throw new NotImplementedException();
+    }
+
+    public void ReplaceToTable(string oldValue, FontProps baseFont, Action<string, ITable> buildTable)
+    {
+        throw new NotImplementedException();
+    }
+
+
+
+
+
+
+
+
     /// <summary>
     /// Добавляет новый параграф с указанным текстом в конец документа.
     /// </summary>