using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"\b(?:(?:0?[0-9]?[0-9]|1?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])\.??\b){4}";
string input = @"Should Match:
204.131.100.104
255.255.005.055
192.168.10.1
172.16.1.1
10.10.10.1
1.2.3.4
255.255.255.255
001.02.3.004
123.145.254.189:8080
1.2.3.4-4.3.20.1
4.3.2.1.9.8.7.6
Shouldnt match:
255.256.255.255
172.999.2.3
this is a string1.2.3.4
this is another 1.2.3.4string
144.109.279.255
v1.2.3.4
";
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