日期范围的正则表达式 [英] Regular expression for a date range

问题描述

如果我有这样的目录结构

If I have a directory structure like this

yyyy/dd/mm/<files>

有没有办法使用正则表达式在给定时间范围内对所有文件中的字符串进行 grep?例如，我有一个时间范围:2010/12/25 - 2011/01/01，我需要 grep 对应于 12 月 25 日至 1 月 1 日的目录中的所有文件

Is there a way to grep for a string in all files in a given time frame using a regex? For example, I have a time frame: 2010/12/25 - 2011/01/01, I need to grep all files in directories corresponding to dates from 25th december to jan 1st

如果我以编程方式执行此操作，与使用正则表达式执行此操作相比，迭代每个 yyyy/dd/mm 目录中的日期范围和 grep 文件是否更好?或者它不会有所作为?

If I am doing this programmatically, is it better to iterate over the date range and grep files in each yyyy/dd/mm directory than to use a regex to do this? Or would it not make a difference?

推荐答案

就你而言，这很简单:

(?:2010/12/(?:3[01]|2[5-9])|2011/01/01)

将匹配包含您指定范围内的日期的字符串.但一般来说，正则表达式不太适合匹配日期范围.这总是一种可能性，但很少是好的.

will match a string that contains a date in the range you specified. But generally, regexes are not a good fit for matching date ranges. It's always a possibility, but rarely a good one.

例如，对于范围 2003/04/25-2011/04/04，您得到

For example, for the range 2003/04/25-2011/04/04, you get

(?:
2003/04/(?:30|2[5-9])|
2003/(?:(?:0[69]|11)/(?:30|[12][0-9]|0[1-9])|(?:0[578]|1[02])/(?:3[01]|[12][0-9]|0[1-9]))|
2011/04/0[1-4]|2011/(?:02/(?:[12][0-9]|0[1-9])|0[13]/(?:3[01]|[12][0-9]|0[1-9]))|
(?:2010|200[4-9])/(?:02/(?:[12][0-9]|0[1-9])|(?:0[469]|11)/(?:30|[12][0-9]|0[1-9])|(?:0[13578]|1[02])/(?:3[01]|[12][0-9]|0[1-9]))
)

如果我必须做这样的事情(并且不能在文件属性中使用创建日期)，我会使用 RegexMagic(创建日期范围正则表达式)和 PowerGREP(进行 grepping)一次性工作，但这些仅在 Windows 上可用.如果我必须更频繁地执行此操作，我会编写一个小的 Python 脚本来遍历我的目录树，解析每个目录的日期，检查它是否在范围内，然后查看该目录中的文件.

If I had to do something like this (and couldn't use the creation dates in the file attributes), I would either use RegexMagic (to create the date range regex) and PowerGREP (to do the grepping) if it's a one-time job, but these are only available on Windows. If I had to do this more often, I'd write a small Python script that walks through my directory tree, parses the date for each directory, checks if it's in range, and then looks at the files in that directory.

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