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...

imp         


        

Answer 1

IP address uses following authentication :

1. 255 ---> 250-255
2. 249 ---> 200-249
3. 199 ---> 100-199
4. 99 ---> 10-99

5. 9 ---> 1-9

   import re    
   k = 0
   while k < 5 : 
       i = input("\nEnter Ip address : ")
       ip = re.match("^([1][0-9][0-9].|^[2][5][0-5].|^[2][0-4][0-9].|^[1][0-9][0-9].|^[0-9][0-9].|^[0-9].)([1][0-9][0-9].|[2][5][0-5].|[2][0-4][0-9].|[1][0-9][0-9].|[0-9][0-9].|[0-9].)([1][0-9][0-9].|[2][5][0-5].|[2][0-4][0-9].|[1][0-9][0-9].|[0-9][0-9].|[0-9].)([1][0-9][0-9]|[2][5][0-5]|[2][0-4][0-9]|[1][0-9][0-9]|[0-9][0-9]|[0-9])$",i)
       k = k + 1 
       if ip:
           print ("\n=====================")
           print ("Valid IP address")
           print ("=====================")
           break
       else :
           print ("\nInvalid IP")
   else :
       print ("\nAllowed Max 5 times")
   

Reply me if you have doubt?