how to extract isbn 10/13 number from text using regular expression

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C#

.NET

regular-expression

hi, i need to extract the isbn 10/13 code from the text i tried 2-3 regular expression but none of them working could anyone help me to solve my problem. following is my implementation if possible tell me what is wrong with my code.

string strRegex = @"ISBN\x20(?=.{13}$)\d{1,5}([- ])\d{1,7}\1\d{1,6}\1(\d|X)$";
            RegexOptions myRegexOptions = RegexOptions.None;
            Regex myRegex = new Regex(strRegex, myRegexOptions);
            string strTargetString = @"Thank you for picking up WPF 4 Unleashed! Windows Presentation Foundation (WPF) is Microsoft’s premier technology for creating Windows graphical user interfaces, whether they consist of plain forms, document-centric windows, animated cartoons, videos, immersive 3D environments, or all of the above. WPF is a technology that makes it easier than ever to create a broad range of applications. " + "\n" + @"ISBN-13: 978-0-672-33119-0 " + "\n" + @"ISBN-10: 0-672-33119-5" + "\n" + @"It’s also the basis for Silverlight, which has extended WPF technology onto the Web and into devices such as Windows phones.";

            foreach (Match myMatch in myRegex.Matches(strTargetString))
            {
                if (myMatch.Success)
                {
                    Console.WriteLine(myMatch.Groups[1].Value);
                }
            }