There are modifiers Regexp::Common allows for some other formats (like "dotted hex"), but not all possible formats (a simple 32-bit number, for example).

Yeah, it's true that IP addresses can be given as a 32-bit number, and while I've encountered such IP addresses many times, it's always as data in a program, or binary data between programs. I've never found myself parsing 32 bit numbers out of a file, to get the IP address.

Abigail