using System;
using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
var html = @"<description=""This chapter builds upon the information in part 1 (""Introduction to Dynamic Equations"")"">";
var filter = new Regex("(?<=description=\\\")(.+)(?=\\\">)");
Console.WriteLine(filter.Match(html).ToString());
}
}
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