Re: [GENERAL] Backward compatibility

Thx.
The split_part() works perfectly.

On Sat, Jul 22, 2017 at 10:49 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Igor Korot <ikorot01@gmail.com> writes:
>> But it works incorrectly - it should return:
>> 9.5.7 on x86_64-redhat-linux-gnu, compiled by gcc (GCC) 6.3.1 20161221
>> (Red Hat 6.3.1-1), 64-bit
>> i.e. without the word "PosgreSQL", since '\s' should match the (first)
>> space in the version().
>
> position() is not a regex operation, it's just a plain substring match.
>
> regression=# SELECT  position( '\s' in version() ) ;
>  position
> ----------
>         0
> (1 row)
>
> You hardly need any flexibility for this anyway, so I'd just do
>
> regression=# SELECT  position( ' ' in version() ) ;
>  position
> ----------
>        11
> (1 row)
>
> Although possibly what you really want is split_part().
>
> regression=# select split_part(version(), ' ', 2);
>  split_part
> ------------
>  9.5.7
> (1 row)
>
>                         regards, tom lane