Add the sample for apply bold formatting for place holder

Find-and-Replace/Apply-bold-between-placeholder/Apply-bold-between-placeholder.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.12.35309.182
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Apply-bold-between-placeholder", "Apply-bold-between-placeholder\Apply-bold-between-placeholder.csproj", "{6CFD18EF-7889-4C29-A964-0FB48FBEEDFC}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{6CFD18EF-7889-4C29-A964-0FB48FBEEDFC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{6CFD18EF-7889-4C29-A964-0FB48FBEEDFC}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{6CFD18EF-7889-4C29-A964-0FB48FBEEDFC}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{6CFD18EF-7889-4C29-A964-0FB48FBEEDFC}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {2127D849-B1E6-4BC4-8628-B8D6F0142835}
+	EndGlobalSection
+EndGlobal

Find-and-Replace/Apply-bold-between-placeholder/Apply-bold-between-placeholder/Apply-bold-between-placeholder.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>Apply_bold_between_placeholder</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+	<ItemGroup>
+		<PackageReference Include="Syncfusion.DocIO.NET" Version="*" />
+	</ItemGroup>
+
+	<ItemGroup>
+		<None Update="Data\Template.docx">
+		  <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+		</None>
+		<None Update="Output\.gitkeep">
+			<CopyToOutputDirectory>Always</CopyToOutputDirectory>
+		</None>
+	</ItemGroup>
+
+</Project>

Find-and-Replace/Apply-bold-between-placeholder/Apply-bold-between-placeholder/Output/.gitkeep

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+

Find-and-Replace/Apply-bold-between-placeholder/Apply-bold-between-placeholder/Program.cs

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+using Syncfusion.DocIO.DLS;
+using Syncfusion.DocIO;
+using System.Text.RegularExpressions;
+
+using (FileStream inputFileStream = new FileStream(Path.GetFullPath(@"Data/Template.docx"), FileMode.Open, FileAccess.Read))
+{
+    // Create a WordDocument instance by loading the DOCX file from the file stream.
+    using (WordDocument document = new WordDocument(inputFileStream, FormatType.Docx))
+    {
+        // Apply bold formatting to specific text using a regular expression.
+        ApplyBoldUsingRegex(document);
+
+        // Save the modified document to an output file.
+        using (FileStream outputFileStream = new FileStream(Path.GetFullPath(@"Output/Result.docx"), FileMode.OpenOrCreate, FileAccess.ReadWrite))
+        {
+            document.Save(outputFileStream, FormatType.Docx);
+        }
+    }
+}
+
+// Method to apply bold formatting to text matching a specific regex pattern.
+static void ApplyBoldUsingRegex(WordDocument document)
+{
+    int startTagIndex = 0;  // To store the index of the start tag.
+    int endTagIndex = 0;    // To store the index of the end tag.
+    WParagraph para = null; // Reference to the paragraph containing the tags.
+    WTextRange startTextRange = null; // Text range for the start tag.
+    WTextRange endTextRange = null;   // Text range for the end tag.
+
+    // Find the text that matches the <b>...</b> pattern using a regex.
+    TextSelection[] textSelections = document.FindAll(new Regex("<b>(.*)</b>"));
+
+    foreach (TextSelection textSelection in textSelections)
+    {
+        // Get all text ranges that match the regex pattern.
+        WTextRange[] textRanges = textSelection.GetRanges();
+
+        // Iterate through each matched text range.
+        for (int i = 0; i < textRanges.Length; i++)
+        {
+            WTextRange textRange = textRanges[i];
+
+            // If the text range contains both <b> and </b> tags.
+            if (i == 0 || i == textRanges.Length - 1)
+            {
+                if (textRange.Text.Contains("<b>") && textRange.Text.Contains("</b>"))
+                {
+                    // Process the text with both start and end tags.
+                    ProcessTextWithStartAndEndTags(textRange);
+                }
+                else if (textRange.Text.Contains("<b>") || textRange.Text.Contains("</b>"))
+                {
+                    // Process the text with only the start or end tag.
+                    ProcessTextWithPartialTags(textRange, ref para, ref startTextRange, ref endTextRange, ref startTagIndex, ref endTagIndex);
+                }
+            }
+            else
+            {
+                // Apply bold formatting to the text between <b> and </b>.
+                textRange.CharacterFormat.Bold = true;
+            }
+        }
+
+        // Insert the start and end text ranges if applicable.
+        if (para != null)
+        {
+            para.ChildEntities.Insert(startTagIndex, startTextRange);
+            para.ChildEntities.Insert(endTagIndex + 1, endTextRange);
+        }
+    }
+}
+
+// Process text that contains both <b> and </b> tags.
+static void ProcessTextWithStartAndEndTags(WTextRange textRange)
+{
+    // Find the indexes of the start and end tags.
+    int startIndex = textRange.Text.IndexOf("<b>") + 3;
+    int endIndex = textRange.Text.IndexOf("</b>");
+
+    // Create text ranges for the text before the start tag and after the end tag.
+    WTextRange startTextRange1 = CreateTextRange(textRange, textRange.Text.Substring(0, startIndex));
+    WTextRange endTextRange1 = CreateTextRange(textRange, textRange.Text.Substring(endIndex));
+
+    // Extract and format the text within the tags.
+    string boldText = textRange.Text.Substring(startIndex, endIndex - startIndex);
+    textRange.Text = boldText;
+    textRange.CharacterFormat.Bold = true;
+
+    // Insert the start and end text ranges into the paragraph.
+    WParagraph para = textRange.OwnerParagraph;
+    int index = para.ChildEntities.IndexOf(textRange);
+    para.ChildEntities.Insert(index, startTextRange1);
+    para.ChildEntities.Insert(index + 2, endTextRange1);
+}
+
+// Process text that contains only <b> or only </b> tags.
+static void ProcessTextWithPartialTags(WTextRange textRange, ref WParagraph para, ref WTextRange startTextRange, ref WTextRange endTextRange, ref int startTagIndex, ref int endTagIndex)
+{
+    if (textRange.Text.Contains("<b>"))
+    {
+        // If the text contains only the start tag <b>.
+        int startIndex = textRange.Text.IndexOf("<b>") + 3;
+        startTextRange = CreateTextRange(textRange, textRange.Text.Substring(0, startIndex));
+        para = textRange.OwnerParagraph;
+        startTagIndex = para.ChildEntities.IndexOf(textRange);
+        textRange.Text = textRange.Text.Replace("<b>", "");
+    }
+    else if (textRange.Text.Contains("</b>"))
+    {
+        // If the text contains only the end tag </b>.
+        int endIndex = textRange.Text.IndexOf("</b>");
+        endTextRange = CreateTextRange(textRange, textRange.Text.Substring(endIndex));
+        para = textRange.OwnerParagraph;
+        endTagIndex = para.ChildEntities.IndexOf(textRange);
+        textRange.Text = textRange.Text.Replace("</b>", "");
+    }
+
+    // Apply bold formatting to the text.
+    textRange.CharacterFormat.Bold = true;
+}
+
+// Utility method to create a new WTextRange with the given text.
+static WTextRange CreateTextRange(WTextRange original, string text)
+{
+    // Clone the original text range and update its text.
+    WTextRange newTextRange = original.Clone() as WTextRange;
+    newTextRange.Text = text;
+    return newTextRange;
+}