using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"\/\/([a-zA-Z0-9]+\.)*(?<http_referrer_domain>[a-zA-Z0-9][a-zA-Z0-9-]*?)\.[a-zA-Z]{2,}";
string input = @"
http://mail.google.com/
http://icycanada.com/
https://www.sfo.semrush.com/tracking/overview/2707853.html?domain_1=cyzerg.com&report_mode=domain_1&sort=nq_desc&page=1
";
RegexOptions options = RegexOptions.Multiline;
foreach (Match m in Regex.Matches(input, pattern, options))
{
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