Python正则表达式提取日期 [英] Python Regular Expressions to extract date

问题描述

我有这样的字符串:

{server}_{date:YYYYMMDD}{int:######}{server}_{date:MON DAY YYYY}{int:######}

...加上更多，以不同的日期格式.此外，可以有任意数量的 {} 块，它们可以按任意顺序出现.

我试图在 Python 3.2 中只获取大括号之间的日期"部分.因此，对于第一个字符串，我只想获取{date:YYYYMMDD}"，而对于第二个字符串，我只想获取{date:MON DAY YYYY}".日期"块中我想要的唯一字符是字母和空格.

我的正则表达式模式是:

\{date:(\w|\s)*\}

我已经在 这个 Regex builder 上对此进行了测试，但它不是符合预期.这是我在 Python 上的输出:

<预><代码>>>>进口重新>>>re.findall('\{date:(\w|\s)*\}', '{server}_{date:YYYYMMDD}{date:MONDAYYYYY}{int:######}')['D', 'Y']>>>re.findall('\{date:(\w|\s)*\}', '{server}_{date:MON DAY YYYY}{int:######}')['是']

有人可以指出我的模式有什么问题吗?

解决方案

'(\{date:[\w\s]+\})' 给出你想要的:

<预><代码>>>>进口重新>>>re.findall('(\{date:[\w\s]+\})', '{server}_{date:YYYYMMDD}{date:MONDAYYYYY}{int:######}')['{date:YYYYMMDD}', '{date:MONDAYYYYY}']>>>re.findall('(\{date:[\w\s]+\})', '{server}_{date:MON DAY YYYY}{int:######}')['{date:MON DAY YYYY}']

如果你只想要数据值，使用'\{date:([\w\s]+)\}'.

I have strings that look like these:

{server}_{date:YYYYMMDD}{int:######}
{server}_{date:MON DAY YYYY}{int:######}

...plus more, in different date formats. Also, there can be any number of {} blocks, and they can appear in any order.

I'm trying to get just the "date" part between the curly braces in Python 3.2. So for the first string, I want to get just "{date:YYYYMMDD}" and for the second string I want just "{date:MON DAY YYYY}". The only characters I want inside the "date" block are alpha and whitespace.

My regex pattern is:

\{date:(\w|\s)*\}

I've tested this out on this Regex builder, but it's not matching as expected. This is my output on Python:

>>> import re
>>> re.findall('\{date:(\w|\s)*\}', '{server}_{date:YYYYMMDD}{date:MONDAYYYYY}{int:######}')
['D', 'Y']
>>> re.findall('\{date:(\w|\s)*\}', '{server}_{date:MON DAY YYYY}{int:######}')
['Y']

Can someone please point out what's wrong with my pattern?

解决方案

'(\{date:[\w\s]+\})' gives what you want:

>>> import re
>>> re.findall('(\{date:[\w\s]+\})', '{server}_{date:YYYYMMDD}{date:MONDAYYYYY}{int:######}')
['{date:YYYYMMDD}', '{date:MONDAYYYYY}']
>>> re.findall('(\{date:[\w\s]+\})', '{server}_{date:MON DAY YYYY}{int:######}')
['{date:MON DAY YYYY}']

If you want only data value, use '\{date:([\w\s]+)\}'.

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