python之在文本文件中查找所有出现的模式_编程设计

我有一个看起来像这样的文本文件

Nmap scan report for 192.168.2.1 
Host is up (0.023s latency). 
PORT     STATE  SERVICE 
5001/tcp closed commplex-link 
MAC Address: EC:1A:59:A2:84:80 (Belkin International) 
 
Nmap scan report for 192.168.2.2 
Host is up (0.053s latency). 
PORT     STATE  SERVICE 
5001/tcp closed commplex-link 
MAC Address: 94:35:0A:F0:47:C2 (Samsung Electronics Co.) 
 
Nmap scan report for 192.168.2.3   
Host is up (0.18s latency).   
PORT     STATE    SERVICE   
5001/tcp filtered commplex-link   
MAC Address: 00:13:CE:C0:E5:F3 (Intel Corporate)   
 
Nmap scan report for 192.168.2.6 
Host is up (0.062s latency). 
PORT     STATE  SERVICE 
5001/tcp closed commplex-link 
MAC Address: 90:21:55:7D:53:4F (HTC)

我想找到所有关闭(未过滤)端口 5001 的 IP。我尝试使用以下逻辑找到所有此类 IP

fp = open('nmap_op.txt').read() 
ip = re.compile('([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)(.*)closed',re.S) 
matched = ip.findall(fp) 
for item in matched: 
  print item

我期待的输出是

192.168.2.1

192.168.2.2

192.168.2.6

但我没有得到想要的输出。输出只是一个看起来像这样的项目:

('192.168.2.1', '\nHost is up (0.023s latency).\nPORT STATE SERVICE\n5001/tcp closed commplex-link\nMAC Address: EC:1A:59:A2:84:80 (Belkin International)\n\nNmap scan report for 192.168.2.2\nHost is up (0.053s latency).\nPORT STATE SERVICE\n5001/tcp closed commplex-link\nMAC Address: 94:35:0A:F0:47:C2 (Samsung Electronics Co.)\n\nNmap scan report for 192.168.2.3\nHost is up (0.18s latency).\nPORT STATE SERVICE\n5001/tcp filtered commplex-link\nMAC Address: 00:13:CE:C0:E5:F3 (Intel Corporate)\n\nNmap scan report for 192.168.2.6\nHost is up (0.062s latency).\nPORT STATE SERVICE\n5001/tcp )

我哪里错了？

解决方法: 以下逻辑对我有用。如果有人有更好的答案，请告诉我。

fp = open('nmap_op.txt').read() 
entries = re.split('\n\n',fp)   
ip = re.compile('([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+).*?closed',re.S) 
matched = [] 
for item in entries: 
  if ip.search(item): 
    matched.append(ip.search(item).group(1))

请您参考如下方法:

你不需要 re.S这里。 s 修饰符将点元字符 (.) 的含义从“匹配所有除外换行符 "到 "匹配所有包括换行符"。你在这里不需要那个。

第二个捕获组也不是必需的。您可以删除它以仅返回 IP:

>>> matched = re.findall('([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+).*closed', fp) 
>>> matched 
['192.168.2.1', '192.168.2.2', '192.168.2.6']