| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | "Marc G(dot) Fournier" <scrappy(at)hub(dot)org>, Thomas Lockhart <lockhart(at)fourpalms(dot)org>, Peter Eisentraut <peter_e(at)gmx(dot)net>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: The TODO List (Was: Re: Open 7.3 items) |
| Date: | 2002-09-19 15:32:50 |
| Message-ID: | 200209191532.g8JFWoL04595@candle.pha.pa.us |
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| Lists: | pgsql-hackers |
Tom Lane wrote:
> AFAICS, getting SIMILAR TO to operate per spec would require adding some
> sort of translation function that converts the spec-style pattern into
> a Posix pattern that our regex match engine would handle. This would at
> least require adding ^ and $ around the pattern, converting the escape
> character if any, and translating % and _ into .* and . respectively.
> There are probably some differences of detail that we'd need to fix
> later, but that would get it to a state where we need not be ashamed
> to release it.
>
> We already have a similar mechanism for handling LIKE ... ESCAPE
> clauses, so it doesn't seem too difficult to do. But I haven't got
> time for it...
It seems like a merge of regex and LIKE patterns. ANSI doesn't have
regex so maybe SIMILAR TO is their solution to that.
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
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