驗證合法ip用正則太麻煩，socket模組拿來用就好，

import socket

def validate_ip_address(ipstr, proto=4):
    """
    Validate specified IP address is legal IPv4 or IPv6 address
    """

    family = socket.AF_INET6 if proto == 6 else socket.AF_INET
    try:
        socket.inet_pton(family, ipstr)#inet_aton only support ipv4
 

        return True
    except (socket.error, OSError):
        return False
        

socket.inet_pton: Convert an IP address from its family-specific string format to a packed, binary forma

換個思維，如果能夠轉換成功，說明是合法ip