IPv4 Regex

IPv4 Regex

# this is correction to https://stackoverflow.com/a/39136481
# Following is python

import re

ip_list = ['10.101.0.11','011.101.232.111', '01.01.01.01','000.000.000.000','00.00.00.00','0.0.0.0','011.022.022.011']
regex = r'^(25[0-5]|2[0-4][0-9]|[1-2]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9])\.(25[0-5]|2[0-4][0-9]|[1-2]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[1-2]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[1-2]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])$'

for i in ip_list:
    resp = re.match(regex, i)
    print ('match', i) if resp else print("not match", i)
   
   
output:
match 10.101.0.11
not match 011.101.232.111
not match 01.01.01.01
not match 000.000.000.000
not match 00.00.00.00
not match 0.0.0.0

You can also checkout: https://gist.github.com/mnordhoff/2213179 which has support for IPv6