using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\s+(?:[03-9]|\d{2,})$";
string input = @"# 111.111.111.111
112.112.112.112 1
113.113.113.113 2
114.114.114.114 3
115.115.115.115 4
115.115.115.115 445
115.115.115.115 123";
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