| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Daniel Verite" <daniel(at)manitou-mail(dot)org> |
| Cc: | "Robert Schreiber" <bobschreiber(at)charter(dot)net>, pgsql-bugs(at)lists(dot)postgresql(dot)org |
| Subject: | Re: PostgreSQL 9.3.5 substring(text from pattern for escape) bug |
| Date: | 2019-05-11 15:59:21 |
| Message-ID: | 32565.1557590361@sss.pgh.pa.us |
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| Lists: | pgsql-bugs |
"Daniel Verite" <daniel(at)manitou-mail(dot)org> writes:
> Robert Schreiber wrote:
>> What appears to be happening is that the _Q? on the tail_ is being
>> matched, but _the Q is also being included in the collected data.__
> You seem to expect that % must be non-greedy and let the final Q?
> match 1 Q instead of 0, but there doesn't appear to be anything
> in the doc that supports this interpretation.
> In fact, it mentions that "%" is comparable to ".*" in POSIX
> regular expressions, and the latter _is_ greedy.
Right. You could get the behavior you want using a non-greedy quantifier,
but you'd have to use the POSIX regexp functions, not substring().
regards, tom lane
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