> To: pgsql-sql@postgresql.org
> From: spam_eater@gmx.net
> Subject: [SQL] Using regexp_matches in the WHERE clause
> Date: Mon, 26 Nov 2012 13:13:06 +0100
>
> Hi,
>
> I stumbled over this question on Stackoverflow
>
> http://stackoverflow.com/questions/13564369/postgresql-using-column-data-as-pattern-for-regexp-match
>
> And my initial reaction was, that this should be possible using regexp_matches.
>
> So I tried:
>
> SELECT *
> FROM some_table
> WHERE regexp_matches(somecol, 'foobar') is not null;
>
> However that resulted in: ERROR: argument of WHERE must not return a set
>
> Hmm, even though an array is not a set I can partly see what the problem is
> (although given the really cool array implementation in PostgreSQL I was a bit surprised).
>
>
> So I though, if I convert this to an integer, it should work:
>
> SELECT *
> FROM some_table
> WHERE array_length(regexp_matches(somecol, 'foobar'), 1) > 0
>
> but that still results in the same error.
>
> But array_length() clearly returns an integer, so why does it still throw this error?
>
>
> I'm using 9.2.1
>
> Regards
> Thomas
>
>
>
>
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