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