Using a RegEx to match IP addresses in Python

Question

I\'m trying to make a test for checking whether a sys.argv input matches the RegEx for an IP address...

As a simple test, I have the following...

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Answer 1

""" regex for finding valid ip address """

import re


IPV4 = re.fullmatch('([0-2][0-5]{2}|\d{2}|\d).([0-2][0-5]{2}|\d{2}|\d).([0-2][0-5]{2}|\d{2}|\d).([0-2][0-5]{2}|\d{2}|\d)', '100.1.1.2')

if IPV4:
    print ("Valid IP address")

else:
    print("Invalid IP address")

Answer 2

You have to modify your regex in the following way

pat = re.compile("^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$")

that's because . is a wildcard that stands for "every character"

Answer 3

regex for ip v4:

^((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]?)$

otherwise you take not valid ip address like 999.999.999.999, 256.0.0.0 etc

Answer 4

import re

st1 = 'This is my IP Address10.123.56.25 789.356.441.561 127 255 123.55 192.168.1.2.3 192.168.2.2 str1'

Here my valid IP Address is only 192.168.2.2 and assuming 10.123.56.25 is not a valid one as it is combined with some string and 192.168.1.2.3 not valid.

pat = r'\s(((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])\s|$))'

match = re.search(pat,st1)

print match.group()

================ RESTART: C:/Python27/Srujan/re_practice.py ================
192.168.2.2 

This will grep the exact IP Address, we can ignore any pattern look like an IP Address but not a valid one. Ex: 'Address10.123.56.25', '789.356.441.561' '192.168.1.2.3'.

Please comment if any modifications are required.

Answer 5

str = "255.255.255.255"
print(str.split('.'))

list1 = str.split('.')

condition=0

if len(list1)==4:
    for i in list1:
        if int(i)>=0 and int(i)<=255:
            condition=condition+1

if condition!=4:
    print("Given number is not IP address")
else:
    print("Given number is valid IP address")

Answer 6

This works for python 2.7:

import re
a=raw_input("Enter a valid IP_Address:")
b=("[0-9]+"+".")+"{3}"
if re.match(b,a) and b<255:
    print "Valid"
else:
    print "invalid"