python - 提取消息的正则表达式

Question

我有一个读取文件行的​​脚本..有些行包含错误消息..所以我做了一个循环（这里只是一行）来查找这些行并提取消息：

import re

data = "15:31:17 TPP    E Line 'MESSAGE': There is a technical problem in the server."

if (re.findall(".*E Line.*",data)):
    err = re.match(r'\'MESSAGE\':\s(*$)',data)
    print err

执行此脚本时出现错误：/我希望它返回：

There is a technical problem in the server

Answer 1

如果它们都遵循相同的格式，则不需要正则表达式：

>>> data = "15:31:17 TPP    E Line 'MESSAGE': There is a technical problem in the server."
>>> data.rsplit(':', 1)[1]
' There is a technical problem in the server.'

但如果你必须使用它们...

>>> data = "15:31:17 TPP    E Line 'MESSAGE': There is a technical problem in the server."
>>> ms = re.search(r"'MESSAGE': (.*)$", data)
>>> ms.group(1)
'There is a technical problem in the server.'

---

如果你愿意，你也可以提取其他信息：

>>> ms = re.match(r"(\d\d:\d\d:\d\d)\s+(\S+)\s+(\S+)\s+Line\s+'MESSAGE':\s+(.*)", data)
>>> ms.groups()
('15:31:17', 'TPP', 'E', 'There is a technical problem in the server.')

Answer 2

尝试这个：

import re

data = "15:31:17 TPP    E Line 'MESSAGE': There is a technical problem in the server."

r = re.compile("^.*E Line.*'MESSAGE':[ ]*([^ ].*)$")
m = r.match(data)
if m:
    err = m.group(1)
    print(err)

当然，您应该在循环之外编译正则表达式。