System.Text.RegularExpressions - IP Address (IPv4) Regex .NET

IP Address (IPv4) Regex .NET

Regular expressions are very commonly used by any developer no matter what language he's writing his program. Today I'll show the most useful Regex that sooner or later you will need them. For c# or vb.net. You want to check whether a certain string represents a valid IPv4 address in 255.255.255.255 notation. Optionally, you want to convert this address into a 32-bit integer.

Tags: #dns, #domain, #host, #internet, #ip, #ip address, #ipv4, #regex, #regexp, #web. Views: 9850. stackoverflow, 7/28/2015
Link 1: http://www.systemtextregularexpressions.com/m17/ip-address-ipv4-regex-.net
Link 2: http://www.systemtextregularexpressions.com/m17 (short)

Value

Index

Length

Groups

Captures

127.0.0.1

198.168.23.1

Count: 2, Time: 00:00:00

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//.NET Regex.Match Online Tester: www.systemtextregularexpressions.com

//Namespace
using System.Text.RegularExpressions;

//Regex Pattern
string pattern = @"^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$";

//Regex example #1
Regex r = new Regex(@"^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$", RegexOptions.Multiline);
Match m1 = r.Match("input text");
MatchCollection mc1 = r.Matches("input text");

//Regex example #2
Match m2 = Regex.Match("input text", @"^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$", RegexOptions.Multiline);
MatchCollection mc2 = Regex.Matches("input text", @"^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$", RegexOptions.Multiline);

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'.NET Regex.Match Online Tester: www.systemtextregularexpressions.com

'Namespace
Imports System.Text.RegularExpressions

'Regex Pattern
Dim pattern As String = "^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$"

'Regex example #1
Dim r As Regex = New Regex("^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$", RegexOptions.Multiline)
Dim m1 As Match = r.Match("input text")
Dim mc As MatchCollection = r.Matches("input text")

'Regex example #2
Dim m2 As Match = Regex.Match("input text", "^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$", RegexOptions.Multiline)
Dim mc2 As MatchCollection = Regex.Matches("input text", "^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$", RegexOptions.Multiline)

System.Text.RegularExpressions .NET Regex.Match

IP Address (IPv4) Regex .NET

IsMatch=true

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