Question

我有一个问题，我需要从电子邮件标题的以下部分获取IP地址。

Received: from smtprelay.b.mail.com (smtprelay0225.b.mail.com. [11.11.11.11])
    by mx.google.com with ESMTP id g7si12282480pat.225.2014.07.26.06.53.24
    for <a@gmail.com>;

我只需要在python中使用正则表达式输出11.11.11.11。

将不胜感激。

感谢。

Answer 1

(?<=\[)\d+(?:\.\d+){3}(?=\])

试试这个。使用re.findall。

import re
p = re.compile(ur'(?<=\[)\d+(?:\.\d+){3}(?=\])')
test_str = u"Received: from smtprelay.b.mail.com (smtprelay0225.b.mail.com. [11.11.11.11])\n by mx.google.com with ESMTP id g7si12282480pat.225.2014.07.26.06.53.24\n for <a@gmail.com>;"

re.findall(p, test_str)

参见演示。

http://regex101.com/r/gT6kI4/10

Answer 2

好像你正试图获取[]括号内的数据。

>>> import re
>>> s = """Received: from smtprelay.b.mail.com (smtprelay0225.b.mail.com. [11.11.11.11])
...     by mx.google.com with ESMTP id g7si12282480pat.225.2014.07.26.06.53.24
...     for <a@gmail.com>;"""
>>> re.search(r'(?<=\[)[^\[\]]*(?=\])', s).group()
'11.11.11.11'

OR

>>> re.findall(r'(?<![.\d])\b\d{1,3}(?:\.\d{1,3}){3}\b(?![.\d])', s)
['11.11.11.11']

Answer 3

使用正则表达式

(?<=\[)\d{1,3}(?:\.\d{1,3}){3}(?=\])

提取ip

了解正则表达式的工作原理：http://regex101.com/r/lI0rU3/1

x="""Received: from smtprelay.b.mail.com (smtprelay0225.b.mail.com. [11.11.11.11])
...     by mx.google.com with ESMTP id g7si12282480pat.225.2014.07.26.06.53.24
...     for <a@gmail.com>;"""
>>> re.findall(r'(?<=\[)\d{1,3}(?:\.\d{1,3}){3}(?=\])', x)
['11.11.11.11']

Answer 4

>>> import re
>>> a="""from smtprelay.b.mail.com (smtprelay0225.b.mail.com. [11.11.11.11])
...     by mx.google.com with ESMTP id g7si12282480pat.225.2014.07.26.06.53.24
...     for <a@gmail.com>;"""
>>> re.findall(r'\[(.*)\]',a)
['11.11.11.11']

Answer 5

>>> f=open("file")
>>> for line in f:
...   if "Received" in line:
...     print line.split("]")[0].split("[")[-1]
...
11.11.11.11

使用正则表达式从电子邮件标题中查找IP地址

5 个答案: