using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?<=\/)[^\/]*(?=\?)";
string input = @"<html>
<body>
<iframe src=https://zarabol.rediff.com/widget/end-of-cold-war-salman-hugs-abhishek-bachchan?search=true&header=true id=rediff_zarabol_widget name=rediff_zarabol_widget scrolling=auto transparency= frameborder=0 height=500 width=100%>
</iframe>
</body>
</html>";
foreach (Match m in Regex.Matches(input, pattern))
{
Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index);
}
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx