ByteScout Premium Suite – C# – Regular expression search and highlight in PDF

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ByteScout Premium Suite – C# – Regular expression search and highlight in PDF

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ByteScout-Premium-Suite-C-sharp-Regular-expression-search-and-highlight-in-PDF.pdf

How to regular expression search and highlight in PDF in C# with ByteScout Premium Suite

Learning is essential in computer world and the tutorial below will demonstrate how to regular expression search and highlight in PDF in C#

These source code samples are assembled by their programming language and functions they apply. ByteScout Premium Suite can regular expression search and highlight in PDF. It can be applied from C#. ByteScout Premium Suite is the bundle that includes twelve SDK products from ByteScout including tools and components for PDF, barcodes, spreadsheets, screen video recording.

The SDK samples given below describe how to quickly make your application do regular expression search and highlight in PDF in C# with the help of ByteScout Premium Suite. Just copy and paste the code into your C# application’s code and follow the instructions. Use of ByteScout Premium Suite in C# is also described in the documentation included along with the product.

Our website gives trial version of ByteScout Premium Suite for free. It also includes documentation and source code samples.

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Program.cs

      using System.Diagnostics;
using System.Drawing;
using Bytescout.PDFExtractor;
using Bytescout.PDF;
using Pen = Bytescout.PDF.Pen;
using SolidBrush = Bytescout.PDF.SolidBrush;

namespace SearchAndHighlightExample
{
	class Program
	{
		static void Main(string[] args)
		{
			const string inputFile = @"sample.pdf";
			const int pageIndex = 0;
			const string searchPattern = "\\d+\\.\\d+";

			// Prepare TextExtractor
			using (TextExtractor textExtractor = new TextExtractor("demo", "demo"))
			{
				textExtractor.RegexSearch = true;
				textExtractor.LoadDocumentFromFile(inputFile);

				// Load document with PDF SDK
				using (Document pdfDocument = new Document(inputFile))
				{
					pdfDocument.RegistrationName = "demo";
                	pdfDocument.RegistrationKey = "demo";

					Page pdfDocumentPage = pdfDocument.Pages[pageIndex];
					Canvas canvas = pdfDocumentPage.Canvas;

					SolidBrush fillBrush = new SolidBrush(new ColorRGB(255, 0, 0));
					fillBrush.Opacity = 50; // make the brush transparent

					// Search for pattern and highlight found pieces
					if (textExtractor.Find(pageIndex, searchPattern, caseSensitive: false))
					{
						do
						{
							foreach (var foundPiece in textExtractor.FoundText.Elements)
							{
								// Inflate the rectangle a bit
								RectangleF rect = RectangleF.Inflate(foundPiece.Bounds, 1, 2);
								// Draw rectangle over the PDF page
								canvas.DrawRectangle(fillBrush, rect);
							}
						} while (textExtractor.FindNext());
					}

					// Save as new PDF document
					pdfDocument.Save("result.pdf");

					// Open result document in default associated application (for demo purposes)
					Process.Start("result.pdf");
				}
			}
		}
	}
}