r'(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})'

# importing the module
import re
 
# opening and reading the file
with open('f:/test.txt', encoding='utf-8') as fh:
    fstring = fh.readlines()
 
# declaring the regex pattern for IP addresses
pattern = re.compile(r'(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})')
 
# initializing the list object
lst = []
 
# extracting the IP addresses
for line in fstring:
    match = pattern.search(line)
    if match is not None:
        lst.append(match[0])
    else:
        lst.append(None)
 
# displaying the extracted IP addresses
print(lst)

000.0000.00.00
192.168.1.1
912.465.123.123
192.168.4.164
69.168.4.226
32.89.31.164
67.168.3.227

# importing the module
import re
 
# opening and reading the file
with open('test2.txt', encoding='utf-8') as fh:
    string = fh.readlines()
 
# declaring the regex pattern for IP addresses
pattern = re.compile('''((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]?)''')
 
# initializing the list objects
valid = []
invalid = []
 
# extracting the IP addresses
for line in string:
    line = line.rstrip()
    result = pattern.search(line)
 
    # valid IP addresses
    if result:
        valid.append(line)
 
    # invalid IP addresses
    else:
        invalid.append(line)
 
# displaying the IP addresses
print("Valid IPs")
print(valid)
print("Invalid IPs")
print(invalid)

#!/usr/bin/env python3
# -*- coding:utf-8 -*-

import re
import os

ip_str = os.popen('cat /root/bin/ips').read()
ipList = re.findall( r'[0-9]+(?:\.[0-9]+){3}',ip_str)
print(ipList)