using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^(?:(?:10\.\d{1,3}\.\d{1,3}\.\d{1,3}|172\.(?:(?:1[6-9])|(?:2[0-9])|(?:3[0-1]))\.\d{1,3}\.\d{1,3}|192\.168\.\d{1,3}\.\d{1,3}|127\.\d{1,3}\.\d{1,3}\.\d{1,3})(?::\d{1,5})?)$";
string input = @"127.0.0.1
127.255.255.255
127.0.0.1:3000
10.0.0.1
10.0.0.2
10.0.1.1
10.0.1.2:443
172.16.0.1
172.16.0.2
172.16.1.1
172.16.1.2
192.168.0.1
192.168.0.2
192.168.1.1
192.168.1.2
10.10.10.1
10.10.10.2
172.31.255.1
172.31.255.2
192.168.100.1
192.168.100.2
10.255.255.1
10.255.255.2
8.8.8.8:80
1.1.1.1
1.0.0.1
198.41.0.4
64.233.160.0
208.67.222.222:8080";
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