python匹配请教Python中匹配IP的正则表达式

Python 怎么正则匹配数字和逗号

>>> s="""6,7,4,9,1,8,2,6,7,4,9,8,11,10,9,3,7,5,2,9,8,4,9,6,3,9,7,3,7,8,1""" >>> import re >>> match=re.search(r"(?:d+,)+d+",s) >>> print(match.group(0)) 6,7,4,9,1,8,2,6,7,4,9,8,11,10,9,3,7,5,2,9,8,4,9,6,3,9,7,3,7,8,1

如何利用python语言匹配文本文件中的指定字符串，并将其所在行的后面几

s="指定字符串" f=open("文本文件名") n=int(raw_input("输入输出的行数:")) line=f.readline() while?line: ????if?s?in?line: ????????print?line ????????for?i?in?range(n): ????????????line=f.readline() ????????????if?line: ????????????????print?line ????????????else: ????????????????break ????????if?not?line:break ????line=f.readline()

请教Python中匹配IP的正则表达式

下面是IPv4的IP正则匹配表达式 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"下面是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