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Get IP address - simple non capturing example

?: is used when you want to group an expression, but you do not want to save it as a matched/captured portion of the string. An example would be something to match an IP address: (?:\d{1,3}\.){3}\d{1,3} Note that I don't care about saving the first 3 octets, but the (?:...) grouping allows me to shorten the regex without incurring the overhead of capturing and storing a match.

Tags: #capture, #dns, #group, #ip, #ip address, #non capturing, #uri. Views: 1563. stackoverflow, 7/12/2015
Link 1: http://www.systemtextregularexpressions.com/m10/get-ip-address-simple-non-capturing-example
Link 2: http://www.systemtextregularexpressions.com/m10 (short)

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RegexOptions

IsMatch=true


#ValueIndexLengthGroupsCaptures
0123.34.35.12012Skip Navigation Links.Skip Navigation Links.
Count: 1, Time: 00:00:00

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Source code

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

//Namespace
using System.Text.RegularExpressions;

//Regex Pattern
string pattern = @"(?:\d{1,3}\.){3}\d{1,3}";

//Regex example #1
Regex r = new Regex(@"(?:\d{1,3}\.){3}\d{1,3}");
Match m1 = r.Match("input text");
MatchCollection mc1 = r.Matches("input text");

//Regex example #2
Match m2 = Regex.Match("input text", @"(?:\d{1,3}\.){3}\d{1,3}");
MatchCollection mc2 = Regex.Matches("input text", @"(?:\d{1,3}\.){3}\d{1,3}");
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'.NET Regex.Match Online Tester: www.systemtextregularexpressions.com

'Namespace
Imports System.Text.RegularExpressions

'Regex Pattern
Dim pattern As String = "(?:\d{1,3}\.){3}\d{1,3}"

'Regex example #1
Dim r As Regex = New Regex("(?:\d{1,3}\.){3}\d{1,3}")
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", "(?:\d{1,3}\.){3}\d{1,3}")
Dim mc2 As MatchCollection = Regex.Matches("input text", "(?:\d{1,3}\.){3}\d{1,3}")

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