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Category: Troubleshooting
Description:
When working with IDS/IPS systems, you often have to evaluate complex Regex values in order to determine how a signature works. The captured data packets can often include strings of characters written in regular expressions, or "regex". As such, tools like this site are a great help to assist in evaluating strings and calculations. In fact, it was with help from this tool I was able to create and modify the following regex expressions to evaluate various public and specific IP address ranges:
Any IP
(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)
10.0.0.0/8
10.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)
172.16.0.0/12
172.(?:1[6-9]|01[6-9]|02[0-9]|2[0-9]|03[01]|3[01]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)
192.168.0.0/16
192.168.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)
255.255.255.0/24
255.255.255.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)
Created: 09 Dec 2013 12:31
Updated: 25 Oct 2015 23:18
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