Question

我正在清理其他人的安静应用程序，并且这样做似乎有一些路由没有被使用。为了开始故障排除，我创建了一个带有唯一文本列的表来存储路由。

---------routes---------
https://test.com/user/1/info
https://test.com/test/2/info
https://test.com/banana/100
https://test.com/post/3/date
https://test.com/post/
https://test.com/grape/
http://test.com/post/3/date
https://test.com/banana/3
https://test.com/user/2/info
https://test.com/test/5/info
.
.
.

现在我喜欢做的是，使用一些正则表达式（或其他）查询，对上面的条目进行分组以获得以下结果：

---------routes---------
https://test.com/user/{x}/info
https://test.com/test/{x}/info
https://test.com/post/{x}/date
https://test.com/post/
https://test.com/grape/
http://test.com/post/{x}/date
https://test.com/banana/{x}

其中{x}只是由于分组而产生的一些通用标记。我知道我们可以搜索特定的正则表达式，但我不知道如何尝试将字符串折叠成组，然后吐出“推荐的”分组

PS：因为我们陷入了石器时代，任何解决方案都受到postgresql 8.4.20的限制

编辑 -

克林，你的答案对我来说并不是很有效，因为它给了我

     regexp_replace        | count 
------------------------------+-------
 https://test.com/user/1/info |     1
 https://test.com/test/2/info |     1
 https://test.com/banana/100  |     1
 \x01{x}ate                   |     2
 https://test.com/user/2/info |     1
 https://test.com/grape/      |     1
 https://test.com/test/5/info |     1
 https://test.com/post/       |     1
 https://test.com/banana/3    |     1
(9 rows)

但至少这给了我一些想法，当我再玩一次时我会回复

Answer 1

我无法在8.4 ...

中测试这个

with routes(url) as (
values
    ('https://test.com/user/1/info'),
    ('https://test.com/test/2/info'),
    ('https://test.com/banana/100'),
    ('https://test.com/post/3/date'),
    ('https://test.com/post/'),
    ('https://test.com/grape/'),
    ('http://test.com/post/3/date'),
    ('https://test.com/banana/3'),
    ('https://test.com/user/2/info'),
    ('https://test.com/test/5/info')
)

select regexp_replace(url, '^(.+//.+/.+/)\d+', '\1{x}'), count(*)
from routes
group by 1

         regexp_replace         | count 
--------------------------------+-------
 https://test.com/banana/{x}    |     2
 https://test.com/post/{x}/date |     1
 http://test.com/post/{x}/date  |     1
 https://test.com/user/{x}/info |     2
 https://test.com/test/{x}/info |     2
 https://test.com/grape/        |     1
 https://test.com/post/         |     1
(7 rows)

You can test this here (Postgres 9.5).

Check pattern here.

如何在postgres查询中按正则表达式进行分组

1 个答案: