16725

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

Answer1:

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]?)$

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