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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(); 
615
\d{1,3}\b will match any IP address just fine. But will also match 999.999. 999.999 as if it were a valid IP address. If your regex flavor supports Unicode, it may even match ١٢٣.
Approach: Regex (Regular Expression) In C++ will be used to check the IP address. Specifying a range of characters or literals is one of the simplest criteria used in a regex.
Now if you want to search for lines containing IP addresses, you'll need to use some regular expressions. An IP address is basically a dot separated sequence of 4 numbers each having 1 to 3 digits. So we can represent it this way: grep '[0-9]\{1,3\}\.
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]); 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]?)$ If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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