Re: Escape wildcard problems.

Or you could use:

SELECT name
FROM templates
WHERE name ~ '\_cont\_';

This does it as a regular expression.

~* '\_aa\_';

On Fri, Oct 24, 2008 at 5:07 PM, Craig Ringer
<craig@postnewspapers.com.au> wrote:
> Alan Hodgson wrote:
>> On Friday 24 October 2008, "Gauthier, Dave" <dave.gauthier@intel.com> wrote:
>>> I read in the docs (section 9.7.1) that the backslash... \ ... is the
>>> default escape char to use in "like" expressions.  Yet when I try it, it
>>> doesn't seem to work the ay I expect.  Here's an example...
>>>
>>> select name from templates where name like '%\_cont\_%';
>>>
>>
>> Use double \\ for underscores. I don't know why it's necessary, but it works
>> here.
>
> Here's why. See the documentation for more information:
>
>
> craig=> show standard_conforming_strings;
>  standard_conforming_strings
> -----------------------------
>  off
> (1 row)
>
> craig=> SELECT '%\_cont\_%';
> WARNING:  nonstandard use of escape in a string literal
> LINE 1: SELECT '%\_cont\_%';
>               ^
> HINT:  Use the escape string syntax for escapes, e.g., E'\r\n'.
>  ?column?
> ----------
>  %_cont_%
> (1 row)
>
> craig=> SELECT E'%\\_cont\\_%';
>  ?column?
> ------------
>  %\_cont\_%
> (1 row)
>
> craig=> set standard_conforming_strings = 1;
> SET
>
> craig=> SELECT '%\_cont\_%';
>  ?column?
> ------------
>  %\_cont\_%
> (1 row)
>
>
>
> --
> Craig Ringer
>
> --
> Sent via pgsql-general mailing list (pgsql-general@postgresql.org)
> To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-general
>