884238: sample for Find text by regular expression pattern.

Redaction/Find-text-by-regular-expression-pattern-and-redact-it-from-PDF-document/.NET-Standard/Find_text_by_regular_expression.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.8.34330.188
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Find_text_by_regular_expression", "Find_text_by_regular_expression\Find_text_by_regular_expression.csproj", "{8CD3237D-31CF-49D5-B537-F1CCDEC7B681}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{8CD3237D-31CF-49D5-B537-F1CCDEC7B681}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8CD3237D-31CF-49D5-B537-F1CCDEC7B681}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8CD3237D-31CF-49D5-B537-F1CCDEC7B681}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8CD3237D-31CF-49D5-B537-F1CCDEC7B681}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {B475615B-69EF-40F3-9A7F-72E78EE8AB8D}
+	EndGlobalSection
+EndGlobal

Redaction/Find-text-by-regular-expression-pattern-and-redact-it-from-PDF-document/.NET-Standard/Find_text_by_regular_expression/Find_text_by_regular_expression.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Syncfusion.Pdf.Imaging.Net.Core" Version="25.1.42" />
+  </ItemGroup>
+
+</Project>

Redaction/Find-text-by-regular-expression-pattern-and-redact-it-from-PDF-document/.NET-Standard/Find_text_by_regular_expression/Program.cs

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+
+using Syncfusion.Pdf.Parsing;
+using Syncfusion.Pdf.Redaction;
+using Syncfusion.Pdf;
+using System.Text.RegularExpressions;
+
+//Create stream from an existing PDF document.
+FileStream docStream = new FileStream(Path.GetFullPath("../../../Input.pdf"), FileMode.Open, FileAccess.Read);
+
+//Load the existing PDF document.
+PdfLoadedDocument document = new PdfLoadedDocument(docStream);
+
+//Get the first page from the document.
+PdfLoadedPage page = document.Pages[0] as PdfLoadedPage;
+
+TextLineCollection collection = new TextLineCollection();
+//Extract text from first page.
+string extractedText = page.ExtractText(out collection);
+
+foreach (TextLine line in collection.TextLine)
+{
+    foreach (TextWord word in line.WordCollection)
+    {
+        //Define regular expression pattern to search for dates in the format MM/DD/YYYY
+        string datePattern = @"\b\d{1,2}\/\d{1,2}\/\d{4}\b";
+        //Search for dates
+        MatchCollection dateMatches = Regex.Matches(word.Text, datePattern);
+        //Add redaction if the match found
+        foreach (Match dateMatch in dateMatches)
+        {
+            string textToFindAndRedact = dateMatch.Value;
+            if (textToFindAndRedact == word.Text)
+            {
+                //Create a redaction object.
+                PdfRedaction redaction = new PdfRedaction(word.Bounds, Syncfusion.Drawing.Color.Black);
+                //Add a redaction object into the redaction collection of loaded page.
+                page.AddRedaction(redaction);
+            }
+        }
+    }
+}
+
+//Redact the contents from the PDF document.
+document.Redact();
+
+//Create file stream.
+using (FileStream outputFileStream = new FileStream(Path.GetFullPath(@"../../../Output.pdf"), FileMode.Create, FileAccess.ReadWrite))
+{
+    //Save the PDF document to file stream.
+    document.Save(outputFileStream);
+}
+
+//Close the document.
+document.Close(true);