Python re.search函数正则表达式问题

Question

我有以下代码:

#!/usr/bin/python
import time, uuid, hmac, hashlib, base64, json
import urllib3
import certifi
import datetime
import requests
import re
from datetime import datetime
http = urllib3.PoolManager(
    cert_reqs='CERT_REQUIRED', # Force certificate check.
    ca_certs=certifi.where(),  # Path to the Certifi bundle.
)
#Get the status response from pritunl api
BASE_URL = 'https://www.vpn.trimble.cloud:443'
API_TOKEN = 'gvwrfQZQPryTbX3l03AQMwTyaE0aFywE'
API_SECRET = 'B0vZp5dDyOrshW1pmFFjAnIUyeGtFy9y'
LOG_PATH = '/var/log/developer_vpn/'
def auth_request(method, path, headers=None, data=None):
    auth_timestamp = str(int(time.time()))
    auth_nonce = uuid.uuid4().hex
    auth_string = '&'.join([API_TOKEN, auth_timestamp, auth_nonce,
        method.upper(), path] + ([data] if data else []))
    auth_signature = base64.b64encode(hmac.new(
        API_SECRET, auth_string, hashlib.sha256).digest())
    auth_headers = {
        'Auth-Token': API_TOKEN,
        'Auth-Timestamp': auth_timestamp,
        'Auth-Nonce': auth_nonce,
        'Auth-Signature': auth_signature,
    }
    if headers:
        auth_headers.update(headers)
    return http.request(method, BASE_URL + path, headers=auth_headers, body=data)

response1 = auth_request('GET',
  '/server',
)
if response1.status == 200:
    pritunlServResponse = (json.loads(response1.data))
    #print pritunlServResponse
    #print response1.data
    Name = [y['name'] for y in pritunlServResponse]
    Server_id = [x['id'] for x in pritunlServResponse]
    for srv_name, srv_id in zip(Name, Server_id):
        response2 = auth_request('GET',
        '/server/' + srv_id + '/output',
        )
        pritunlServResponse2 = (json.loads(response2.data))
        py_pritunlServResponse2 = pritunlServResponse2['output']
        print("value of srv_id: ", srv_id, "n")
        print("value of srv_name: ", srv_name, "n") 
        logfile = open(LOG_PATH + srv_name +'_vpn_out.log', 'w')
        for log in py_pritunlServResponse2:
            if re.search(r'(?!52.39.62.8)', log):
                logfile.write("%sn" % log)
        logfile.close()
else:
    raise SystemExit

这段代码访问一个使用身份验证的网站(地址已被编辑)，获取一些JSON格式的文本，并从输出中解析两个值:"srv_name"one_answers"srv_id"。然后，该代码使用"srv_id"构造额外的HTTP请求，以从服务器获取日志文件。然后它抓取日志文件——每个"srv_id"对应一个，用从"srv_name"获得的值命名它们，并将它们保存在本地系统上。

我想在将文件写入本地系统之前做一些额外的grep风格的处理。具体来说，我想排除任何恰好包含"52.39.62.8"的文本。当我运行上面的代码时，看起来regex没有被处理，因为我仍然在输出文件中看到"52.39.62.8"。

Answer 1

如果IP地址两侧总是带有特定字符，例如:(52.39.62.8):，则可以使用in来精确包含:

if '(52.39.62.8):' not in log:
    logfile.write(log + 'n')

Answer 2

re.search(r'(?!52.39.62.8)', log)

您正在匹配任何没有ip地址的空字符串-每个字符串都将匹配，因为它将匹配任何字符串的末尾。

只有当ip地址的re.search返回为None时，反转您的逻辑并将该行输出到日志。

if re.search(r'(?<!d)52.39.62.8(?!d)', log) is None:
    logfile.write("%sn" % log)

请注意，这还包括它自己的负向后看和向前看断言，以确保IP地址之前或之后没有数字。