//your code here...The following code snippet shows you how to search text inside PDF file using a regular expression and adding hyperlinks over the matches. //C# Code Sample //create absorber object to find all instances of the input search phrase TextFragmentAbsorber absorber = new TextFragmentAbsorber("D[a-z]{7}:"); //Enable regular expression search absorber.TextSearchOptions = new TextSearchOptions(true); //open document PdfContentEditor editor = new PdfContentEditor(); // bind source PDF file editor.BindPdf("c:/pdftest/25741-out.pdf"); //accept the absorber for the page editor.Document.Pages[1].Accept(absorber); int[] dashArray = { }; String[] LEArray = { }; System.Drawing.Color blue = System.Drawing.Color.Blue; //loop through the fragments foreach (TextFragment textFragment in absorber.TextFragments) { textFragment.TextState.ForegroundColor = Aspose.Pdf.Color.Blue; System.Drawing.Rectangle rect = new System.Drawing.Rectangle((int)textFragment.Rectangle.LLX, (int)Math.Round(textFragment.Rectangle.LLY), (int)Math.Round(textFragment.Rectangle.Width + 2), (int)Math.Round(textFragment.Rectangle.Height + 1)); Enum[] actionName = new Enum[2] { Aspose.Pdf.InteractiveFeatures.PredefinedAction.Document_AttachFile, Aspose.Pdf.InteractiveFeatures.PredefinedAction.Document_ExtractPages }; editor.CreateWebLink(rect, "http://www.aspose.com", 1, blue, actionName); editor.CreateLine(rect, "", (float)textFragment.Rectangle.LLX + 1, (float)textFragment.Rectangle.LLY - 1, (float)textFragment.Rectangle.URX, (float)textFragment.Rectangle.LLY - 1, 1, 1, blue, "S", dashArray, LEArray); } //Save & Close the document editor.Save("c:/pdftest/TextReplaced_with_Links.pdf"); editor.Close(); //VB.NET Code Sample 'create absorber object to find all instances of the input search phrase Dim absorber As Aspose.Pdf.Text.TextFragmentAbsorber = New Aspose.Pdf.Text.TextFragmentAbsorber("D[a-z]{7}") 'Enable regular expression search absorber.TextSearchOptions = New TextSearchOptions(True) 'open document Dim editor As Aspose.Pdf.Facades.PdfContentEditor = New Aspose.Pdf.Facades.PdfContentEditor() ' bind source PDF file editor.BindPdf("c:/pdftest/25741-out.pdf") 'accept the absorber for the page editor.Document.Pages(1).Accept(absorber) Dim dashArray() As Integer = {} Dim LEArray() As String = {} Dim blue As System.Drawing.Color = System.Drawing.Color.Blue 'loop through the fragments For Each textFragment As Aspose.Pdf.Text.TextFragment In absorber.TextFragments textFragment.TextState.ForegroundColor = Aspose.Pdf.Color.Blue Dim rect As System.Drawing.Rectangle = New System.Drawing.Rectangle(CType(textFragment.Rectangle.LLX, Integer), CType(Math.Round(textFragment.Rectangle.LLY), Integer), CType(Math.Round(textFragment.Rectangle.Width + 2), Integer), CType(Math.Round(textFragment.Rectangle.Height + 1), Integer)) Dim actionName() As System.Enum = New System.Enum() {Aspose.Pdf.InteractiveFeatures.PredefinedAction.Document_AttachFile, Aspose.Pdf.InteractiveFeatures.PredefinedAction.Document_ExtractPages} editor.CreateWebLink(rect, "http://www.aspose.com", 1, blue, actionName) editor.CreateLine(rect, "", CType(textFragment.Rectangle.LLX + 1, Double), CType(textFragment.Rectangle.LLY - 1, Double), CType(textFragment.Rectangle.URX, Double), CType(textFragment.Rectangle.LLY - 1, Double), 1, 1, blue, "S", dashArray, LEArray) Next 'Save & Close the document editor.Save("c:/pdftest/TextReplaced_with_Links.pdf") editor.Close()