Re: Why this regexp matches?!

On 2012-02-04, hubert depesz lubaczewski <depesz@depesz.com> wrote:
> select 'depesz depeszx depesz' ~ E'^(.*)( \\1)+$';
>
> what's worse:
> $ select regexp_replace( 'depesz depeszx depesz', E'^(.*)( \\1)+$', E'\\1' );
>  regexp_replace
> ────────────────
>  depesz
> (1 row)
>
> I know that Pg regexps are limited, but even grep's regexps match this
> correctly:

whose grep?

Postgres is BSD licence and that means they can't use the latest and
greatest GPL libraries.

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