Avoid parsing CIDR notation IPs

[tlansec]

Currently the library will extract IP addresses that are part of a CIDR notation string e.g. given the following text:

The attackers used the netblock "10.20.30.0/24"

The existing regex will parse out the "10.20.30.0" IP as an IP address.

[tlansec]

Shortly after my initial commit I realized my regex change will cause it to not match any IP suffixed by a number, e.g could exclude:

127.0.0.1/1

I've made a change to my initial regex change which is better but will still prevent IP addresses which are suffixed by short numbers of integers from being parsed.

An alternative approach that might be better is a flag which users can set which enables them to knowingly choose to exclude IP addresses that might be part of a CIDR string.

[tlansec]

With the current state of the change:

from iocextract import extract_ips

data = """
127.0.0.1/24
https://127.0.0.2/123 
13.44.55.67/161 
13.44.55.68  
13.44.55.69/456 
13.44.55.70/1
"""

extracted = extract_ips(data)
for e in extracted:
    print(e)

yields:

127.0.0.2
13.44.55.67
13.44.55.68
13.44.55.69

[pedramamini]

Thank you for your efforts!