RegEx for an IP Address

Question

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 p         


        

Answer 1

Regex.IsMatch(input, @"^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$")

Answer 2

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);
}

Answer 3

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]?)$

Answer 4

(\d{1,3}\.){3}(\d{1,3})[^\d\.] 

Check this. It should work perfectly

Answer 5

Regex(@"\A\d{1,3}.\d{1,3}.\d{1,3}.\d{1,3}\z") try with this

Answer 6

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')
>>>