| From: | Andrew Dunstan <andrew(at)dunslane(dot)net> |
|---|---|
| To: | David Fetter <david(at)fetter(dot)org> |
| Cc: | Peter Eisentraut <peter_e(at)gmx(dot)net>, Jeremy Drake <pgsql(at)jdrake(dot)com>, Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL Patches <pgsql-patches(at)postgresql(dot)org>, Neil Conway <neilc(at)samurai(dot)com> |
| Subject: | Re: patch adding new regexp functions |
| Date: | 2007-02-16 18:03:32 |
| Message-ID: | 45D5F1F4.7090502@dunslane.net |
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| Thread: | |
| Lists: | pgsql-hackers pgsql-patches |
David Fetter wrote:
>>
>> The question is, what is the use case? If there is one in Perl, can
>> this proposed function API support it?
>>
>
> Perl makes the following variables available in any regex match,
> although it optimizes some cases for when they're not there:
>
> $1, ... $n (captured matches in parentheses)
> $` (pre-match)
> $' (post-match)
> $& (whole match)
>
>
Use of any of these is notoriously costly, BTW, especially pre-match and
post-match. See perlre man page.
cheers
andrew
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