下面是IPv4的IP正则匹配表达式

1 import re
 2 #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
 3 if re.match(r"^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$", "272.168,1,1"):
 4     print "IP vaild"
 5 else:
 6     print "IP invaild"
 7 #精确的匹配给定的字符串是否是IP地址
 8 if re.match(r"^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$", "223.168.1.1"):
 9     print "IP vaild"
10 else:
11     print "IP invaild"
12 #简单的从长文本中提取中提取ip地址
13 string_ip = "is this 289.22.22.22 ip ?
14 result = re.findall(r"\b(?:[0-9]{1,3}\.){3}[0-9]{1,3}\b", string_ip)
15 if result:
16     print result
17 else:
18     print "re cannot find ip"
19 #精确提取IP
20 result = re.findall(r"\b(?:(?: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]?)\b", string_ip):
21 if result:
22     print result
23 else:
24     print "re cannot find ip

下面是IPv6的正则匹配表达式

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