RegEx for an IP Address
C#.NetRegexC# Problem Overview
I try to extract the value (IP Address) of the wan_ip with this sourcecode: Whats wrong?! I´m sure that the RegEx pattern is correct.
String input = @"var product_pic_fn=;var firmware_ver='20.02.024';var wan_ip='92.75.120.206';if (parent.location.href != window.location.href)";
Regex ip = new Regex(@"[\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b");
string[] result = ip.Split(input);
foreach (string bla in result)
{
Console.WriteLine(bla);
}
Console.Read();
C# Solutions
Solution 1 - C#
The [ shouldn't be at the start of your pattern. Also, you probably want to use Matches(...).
Try:
String input = @"var product_pic_fn=;var firmware_ver='20.02.024';var wan_ip='92.75.120.206';if (parent.location.href != window.location.href)";
Regex ip = new Regex(@"\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b");
MatchCollection result = ip.Matches(input);
Console.WriteLine(result[0]);
Solution 2 - C#
Very old post, you should use the accepted solution, but consider using the right RegEx for an IPV4 adress :
((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]?)
If you want to avoid special caracters after or before you can use :
^((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]?)$
Solution 3 - C#
Try this:
Match match = Regex.Match(input, @"\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}");
if (match.Success)
{
Console.WriteLine(match.Value);
}
Solution 4 - C#
If you just want check correct IP use IPAddress.TryParse
using System.Net;
bool isIP(string host)
{
IPAddress ip;
return IPAddress.TryParse(host, out ip);
}
Solution 5 - C#
I know this post isn't new, but, I've tried several of the proposed solutions and none of them work quite as well as one I found thanks to a link provided by Justin Jones. They have quite a few for IP Address but this is the top of the list and using LinqPad (I LOVE LinqPad) most tests I've thrown at it work extremely well. I recommend utilizing this one rather than any of the previous provided expressions:
^(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9])\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])$
Give that a shot in LinqPad with the following:
// \b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b 355.168.0.1 = 355.168.0.1 (Not Correct)
// ((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]?) 355.168.0.1 = 55.168.0.1 (Not correct)
// \d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3} 355.168.0.1 = 355.168.0.1 (Not Correct)
// ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ 355.168.0.1 = 355.168.0.1 (Not Correct)
// ^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$ 355.168.0.1 = 355.168.0.1 (Not Correct)
// ^(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9])\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])$ 355.168.0.1 = No Match (Correct)
Match match = Regex.Match("355.168.0.1", @"^(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9])\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])$");
if (match.Success) {
Console.WriteLine(match.Value);
}
else {
Console.WriteLine("No match.");
}
With the new RegEx this is not valid which is correct: 355.168.0.1 = No Match which is correct as noted in the comments.
I welcome any tweaks to this as I'm working on a tool that is making use of the expression and am always looking for better ways of doing this.
UPDATE: I've created a .NET Fiddle project to provide a working example of this expression along with a list of IP Addresses that test various values. Feel free to tinker with it and try various values to exercise this expression and provide any input if you find a case where the expression fails. [https://dotnetfiddle.net/JoBXdI][1]
UPDATE 2: Better yet refer to this post: [Another related question.][2]
Thanks and I hope this helps!
[1]: https://dotnetfiddle.net/JoBXdI "Link to .NET Fiddle" [2]: https://stackoverflow.com/questions/106179/regular-expression-to-match-dns-hostname-or-ip-address/
Solution 6 - C#
Regex.IsMatch(input, @"^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$")
Solution 7 - C#
Avoid using /b - it allows characters before or after the IP
For example ...198.192.168.12... was valid.
Use ^ and $ instead if you can split the input into chunks that would isolate the IP address.
Regex regexIP = new Regex(@"^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$");
if (regexIP.Match(textBoxIP.Text).Success){
String myIP = textBoxIP.Text;
}
Note above will not validate the digits, as pointed out 172.316.254.1 was true. This only checks correct formatting.
UPDATE: To validate FORMATTING and VALUES you could use
Regex regexIP = new Regex(@"^([01]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])\.([01]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])\.([01]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])\.([01]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])$");
if (regexIP.Match(textBoxIP.Text).Success){
String myIP = textBoxIP.Text;
}
(note using ([01]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5]) for each numeric value)
Credit: https://stackoverflow.com/a/10682785/4480932
Solution 8 - C#
I think you need to get rid of the [ - is that a stray character or what?
Regex(@"[\b\d{1,3}.\d{1,3}.\d{1,3}.\d{1,3}\b")
Solution 9 - C#
Regex(@"\A\d{1,3}.\d{1,3}.\d{1,3}.\d{1,3}\z") try with this
Solution 10 - C#
I took this pattern from UrlAttribute.cs. at DataAnnotations namespace. As you may see, I took just a piece of the original pattern from source.
Regex.IsMatch(input, @"^(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-
9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-
9]\d|1\d\d|2[0-4]\d|25[0-5])$");
Solution 11 - C#
(\d{1,3}\.){3}(\d{1,3})[^\d\.]
Check this. It should work perfectly
Solution 12 - C#
In Python:
>>> ip_regex = r'^{0}\.{0}\.{0}\.{0}$'.format(r'(25[0-5]|(?:2[0-4]|1\d|[1-9])?\d)')
>>> match(ip_regex, '10.11.12.13')
<re.Match object; span=(0, 11), match='10.11.12.13'>
>>> _.groups()
('10', '11', '12', '13')
>>>
Solution 13 - C#
Another variant, depending on how you want to treat padding (e.g. a.b.c.00 is considered invalid format):
^(?