Python IPV4 / IPV6 Regular Expressions (REGEX)

ip_regex_python.py

import re

def is_ipaddr(input_str: str) -> bool:
    """
    Check if input string is a valid IP address (both IPv4 and IPv6).
    Based on:
        IPv4: https://stackoverflow.com/questions/5284147/validating-ipv4-addresses-with-regexp
        IPv6: https://stackoverflow.com/questions/53497/regular-expression-that-matches-valid-ipv6-addresses

    Args:
        input_str (str): The string to check.

    Returns:
        bool: 
            True if the string is a valid IP address, 
            False if it is not.
    """

    ipv4 = r'^((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)\.?\b){4}$'
    ipv6 = r'(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))'
    return (re.match(ipv4, input_str) or re.match(ipv6, input_str)) is not None