To: pgsql-sql@postgresql.org
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From: Jasen Betts <jasen@xnet.co.nz>
Newsgroups: gmane.comp.db.postgresql.sql
Subject: Re: Regular Expression Match Operator escape character
Date: 13 Dec 2010 09:18:29 GMT
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On 2010-12-08, Gnanakumar <gnanam@zoniac.com> wrote:
> Hi,
>
> We're running PostgreSQL v8.2.3 on RHEL5.
>
> In some places in our application, we use Regular Expression Match Operator
> (~* => Matches regular expression, case insensitive) inside WHERE criteria.
>
> Example:
> SELECT ... 
> FROM ...
> WHERE (SKILLS ~*
> '(^|\\^|\\||[^0-9|^a-z|^A-Z]|$)C#(^|\\^|\\||[^0-9|^a-z|^A-Z]|$)' 
> 	OR SKILLS ~*
> '(^|\\^|\\||[^0-9|^a-z|^A-Z]|$).NET(^|\\^|\\||[^0-9|^a-z|^A-Z]|$)')
>
> In this case, we're trying to search/match for either "C#" OR ".NET" in
> SKILLS column.
>
> My question here is, do I need to escape the characters "#" and "."  here?

yes. ( '.' especially, I don't think '#' has a special meaning in regex)
but as postgres uses posix extended regex simply escaping every non-letter
character is safe.

(^|\\^|\\||[^0-9|^a-z|^A-Z]|$)

seems to be another way to write

 (^|$|[^0-9a-zA-Z])
 
both of which are locale dependant but that may not be an issue for you.


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