Re: BUG #18438: regex isnt working for "^" , ".*"

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От David G. Johnston
Тема Re: BUG #18438: regex isnt working for "^" , ".*"
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Msg-id CAKFQuwYHOkn=ZxEw0EUvUhjhHBpR91E1nm3iSsfUUHoqFA+7Uw@mail.gmail.com
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Ответ на BUG #18438: regex isnt working for "^" , ".*"  (PG Bug reporting form <noreply@postgresql.org>)
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On Mon, Apr 15, 2024 at 1:20 PM PG Bug reporting form <noreply@postgresql.org> wrote:
The following bug has been logged on the website:

Bug reference:      18438
Logged by:          Ankur Kumar
Email address:      ankurawesome37@gmail.com
PostgreSQL version: 14.5
Operating system:   macos ventura version 13.5
Description:       

hey , i am getting empty query result while using postgres regex operator
"^" , ".*" etc . I am able to use "%" correctly but not getting any response
for  other regex operator

As the opening paragraph of the relevant docs say:

There are three separate approaches to pattern matching provided by PostgreSQL: the traditional SQL LIKE operator, the more recent SIMILAR TO operator (added in SQL:1999), and POSIX-style regular expressions. Aside from the basic “does this string match this pattern?” operators, functions are available to extract or replace matching substrings and to split a string at matching locations.

https://www.postgresql.org/docs/current/functions-matching.html

You are mixing the first and third ones together.

David J.

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