ibramoh ibramoh - 1 month ago 17
Python Question

IP address regex python

I am having an issue with Regular expression, I need the most efficient regex that
match IP address and in range of 255 only.

I tried this one "

ip_pattern = '\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}'
" , but it does match even numbers over 255, such as 321.222.11.4

Answer

This should do it:

^(?:(?: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]?)$