Python 3 正则表达式租用 DHCP

Question

我在DHCP租用文件中有如下信息

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";
}

是缩减样本

我需要在申请 Python 后获得当且仅当“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idea或者替代品

我正在做这个...

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来满足条件

当且仅当“绑定状态激活；”

Answer 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并捕获所需的文本：

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)

这会打印：

['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"']

Answer 2

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

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

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