Python 3 正则表达式租赁 DHCP答案

【问题标题】：Python 3 Regular expression Lease DHCPPython 3 正则表达式租赁 DHCP
【发布时间】：2021-08-23 03:40:30
【问题描述】：

我在 DHCP 租用文件中有以下信息

lease 201.249.14.226 { 
  starts epoch 1586469086; # Thu Apr 09 17:51:26 2020
  ends epoch 1587765086; # Fri Apr 24 17:51:26 2020
  tstp epoch 1587765086; # Fri Apr 24 17:51:26 2020
  cltt epoch 1586469086; # Thu Apr 09 17:51:26 2020
  binding state free;
  next binding state free;
  rewind binding state free;
  hardware ethernet f8:d1:11:50:1c:2b;
  set vendor-class-identifier = "MSFT 5.0";
  client-hostname "TL-MR3420";
}
lease 201.249.11.68 {
  starts epoch 1586469229; # Thu Apr 09 17:53:49 2020
  ends epoch 1587765229; # Fri Apr 24 17:53:49 2020
  tstp epoch 1587765229; # Fri Apr 24 17:53:49 2020
  cltt epoch 1586469440; # Thu Apr 09 17:57:20 2020
  binding state active;
  next binding state free;
  rewind binding state free;
  hardware ethernet 34:4d:ea:fa:9d:10;
  option agent.circuit-id "mil-bras-06--172.26.22.237 trunk 0/1/0/2:427.32";
  client-hostname "ZTE";
}
lease 201.249.11.199 {
  starts epoch 1586469229; # Thu Apr 09 17:53:49 2020
  ends epoch 1587765229; # Fri Apr 24 17:53:49 2020
  tstp epoch 1587765229; # Fri Apr 24 17:53:49 2020
  cltt epoch 1586469440; # Thu Apr 09 17:57:20 2020
  binding state active;
  next binding state free;
  rewind binding state free;
  hardware ethernet 34:4d:ea:fa:9d:10;
  option agent.circuit-id "cnt-bras-07--172.26.220.225 trunk 0/1/0/2:427.20";
  client-hostname "ZTE";
}

是一个缩减样本

我需要在应用Python re后得到当且仅当“绑定状态激活”；

下一个：

lease 201.249.11.68
binding state active;
hardware ethernet 34: 4d: ea: fa: 9d: 10;
option agent.circuit-id "mil-bras-06--172.26.22.237 trunk 0/1/0/2: 427.32";
client-hostname "ZTE";

lease 201.249.11.199
binding state active;
hardware ethernet 34: 4d: ea: fa: 9d: 10;
option agent.circuit-id "cnt-bras-07--172.26.220.225 trunk 0/1/0/2: 427.20";
client-hostname "ZTE";

不强制使用python模块（正则表达式）不知道有没有更好的想法或者替代方案

我正在这样做......

import re
with open('/var/lib/dhcp.leases', 'r') as f:
    #pattern = re.compile(r'((option agent.circuit-id)\s"(\w{3}-\w{4}-\d{2}\W{2}))')
    #pattern = re.compile(r'(\W{2}((\d{0,3}).(\d{0,3}).(\d{0,3}).(\d{0,3})\s\w{5}\s[0-9/]{7}:\d{1,3}.\d{1,3}"))')(
    #pattern = re.compile(r'(lease [0-9.]+)')
    #pattern = re.compile(r'binding state active;')
    #pattern = re.compile(r'(hardware ethernet).(\w{2}:\w{2}:\w{2}:\w{2}:\w{2}:\w{2})')
    #pattern = re.compile(r'(option agent.circuit-id)\s["]+(\w{3}-\w{4}-\d{2}\W{2}\d{1,3}[.]\d{1,3}[.]\d{1,3}.*?)')
    contents = f.read()
    matches = pattern.finditer(contents)
    for match in matches:
        print(match)

我有几个单独的模式来查找结果但我不知道如何将它们放在一起满足条件

当且仅当“绑定状态激活；”

【问题讨论】：

标签： python python-3.8 python-re

【解决方案1】：

我们可以在这里尝试使用re.findall，使用正则表达式模式来定位和捕获所需的文本：

matches = re.findall(r'(lease \d+(?:\.\d+){3}) \{[^}]+(binding state active;)[^}]+(hardware[^}]+option[^}]+client[^;]+)', inp)
output = ['\n'.join(x) for x in matches]
print(output)

打印出来：

['lease 201.249.11.68\nbinding state active;\nhardware ethernet 34:4d:ea:fa:9d:10;\n  option agent.circuit-id "mil-bras-06--172.26.22.237 trunk 0/1/0/2:427.32";\n  client-hostname "ZTE"',
 'lease 201.249.11.199\nbinding state active;\nhardware ethernet 34:4d:ea:fa:9d:10;\n  option agent.circuit-id "cnt-bras-07--172.26.220.225 trunk 0/1/0/2:427.20";\n  client-hostname "ZTE"']

【讨论】：

不知道怎么实现
请详细说明你不知道的。在我上面的回答中，只需将您的文本文件读入inp 变量，然后使用我的代码。
工作，谢谢蒂姆

【解决方案2】：

我会使用awk（因为你提到python不是必需的），如下（1行有问题但可以修复）：

Mac_3.2.57$# save lease line;  if bind active, print lease line and active line;  look for other lines and print iff bind is active (finding } logically DE-acivates); plus some format
Mac_3.2.57$cat input.txt | awk '{if($1=="lease"){L=$0;sub(/{/,"",L)};if($0~/ *binding state active; */){print L;f=1};if($0!~/ *next binding state free; */&&$0!~/ *rewind binding state free; */&&$0!~/ *} */&&f==1){print $0};if($0~/ *} */){f=0};if(f==2){print $0}}'
lease 201.249.11.68 
  binding state active;
  hardware ethernet 34:4d:ea:fa:9d:10;
  option agent.circuit-id "mil-bras-06--172.26.22.237 trunk 0/1/0/2:427.32";
  client-hostname "ZTE";
lease 201.249.11.199 
  binding state active;
  hardware ethernet 34:4d:ea:fa:9d:10;
  option agent.circuit-id "cnt-bras-07--172.26.220.225 trunk 0/1/0/2:427.20";
  client-hostname "ZTE";
Mac_3.2.57$
Mac_3.2.57$cat input.txt 
lease 201.249.14.226 { 
  starts epoch 1586469086; # Thu Apr 09 17:51:26 2020
  ends epoch 1587765086; # Fri Apr 24 17:51:26 2020
  tstp epoch 1587765086; # Fri Apr 24 17:51:26 2020
  cltt epoch 1586469086; # Thu Apr 09 17:51:26 2020
  binding state free;
  next binding state free;
  rewind binding state free;
  hardware ethernet f8:d1:11:50:1c:2b;
  set vendor-class-identifier = "MSFT 5.0";
  client-hostname "TL-MR3420";
}
lease 201.249.11.68 {
  starts epoch 1586469229; # Thu Apr 09 17:53:49 2020
  ends epoch 1587765229; # Fri Apr 24 17:53:49 2020
  tstp epoch 1587765229; # Fri Apr 24 17:53:49 2020
  cltt epoch 1586469440; # Thu Apr 09 17:57:20 2020
  binding state active;
  next binding state free;
  rewind binding state free;
  hardware ethernet 34:4d:ea:fa:9d:10;
  option agent.circuit-id "mil-bras-06--172.26.22.237 trunk 0/1/0/2:427.32";
  client-hostname "ZTE";
}
lease 201.249.11.199 {
  starts epoch 1586469229; # Thu Apr 09 17:53:49 2020
  ends epoch 1587765229; # Fri Apr 24 17:53:49 2020
  tstp epoch 1587765229; # Fri Apr 24 17:53:49 2020
  cltt epoch 1586469440; # Thu Apr 09 17:57:20 2020
  binding state active;
  next binding state free;
  rewind binding state free;
  hardware ethernet 34:4d:ea:fa:9d:10;
  option agent.circuit-id "cnt-bras-07--172.26.220.225 trunk 0/1/0/2:427.20";
  client-hostname "ZTE";
}
Mac_3.2.57$

【讨论】：