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From: Thomas Kellerer <spam_eater@gmx.net>
To: pgsql-sql@postgresql.org
Subject: Using regexp_matches in the WHERE clause
Date: Mon, 26 Nov 2012 13:13:06 +0100
Message-ID: <k8vmbm$1fg$1@ger.gmane.org> (raw)
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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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