判断是否是合法的IP地址

ipv4

import re
#简单的匹配给定的字符串是否是ip地址,下面的例子它不是IPv4的地址，但是它满足正则表达式
if re.match(r"^(?:[0-9]{1,3}.){3}[0-9]{1,3}$", "272.168,1,1"):
    print "IP vaild"
else:
    print "IP invaild"
#精确的匹配给定的字符串是否是IP地址
if re.match(r"^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?).){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$", "223.168.1.1"):
    print "IP vaild"
else:
    print "IP invaild"
#简单的从长文本中提取中提取ip地址
string_ip = "is this 289.22.22.22 ip ?
result = re.findall(r"(?:[0-9]{1,3}.){3}[0-9]{1,3}", string_ip)
if result:
    print result
else:
    print "re cannot find ip"
#精确提取IP
result = re.findall(r"(?:(?: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]?)", string_ip):
if result:
    print result
else:
    print "re cannot find ip

IPv6的正则匹配表达式

string_IPv6="1050:0:0:0:5:600:300c:326b"
#匹配是否满足IPv6格式要求,请注意例子里大小写不敏感
if re.match(r"^(?:[A-F0-9]{1,4}:){7}[A-F0-9]{1,4}$", string_IPv6, re.I):
    print "IPv6 vaild"
else:
    print "IPv6 invaild"
#提取IPv6，例子里大小写不敏感
result = re.findall(r"(?<![:.w])(?:[A-F0-9]{1,4}:){7}[A-F0-9]{1,4}(?![:.w])", string_IPv6, re.I)
#打印提取结果
print result

参考：

https://www.cnblogs.com/brogong/p/7929298.html