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- Use a regular expression to extract IPs from the 'ip' command. With this,
there is a little need to validate output. Even though the regex will match
invalid IPs like 192.168.23.444, 'ip' can't return them, and even if it did,
the script would not have reached this function due to previous functions
using the network with broken routes and addresses.
- Get the IP address from the selected interface rather then from the 'ip route'
command as it's not guaranteed that such IP is the same of the interface the
user decided to use (though on a Raspberry Pi inside a home LAN, most likely
it is, but it also maskes easier to get the IP in the CIDR notation with a
single 'ip | grep' pipe).
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