| From: | Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk> |
|---|---|
| To: | pgsql-bugs(at)lists(dot)postgresql(dot)org, zhq651(at)126(dot)com |
| Subject: | Re: BUG #15595: matchctx->npatterns is always 1 no matter pattern have 0 or 1 subexpression |
| Date: | 2019-01-17 02:31:56 |
| Message-ID: | 875zuoja2s.fsf@news-spur.riddles.org.uk |
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| Lists: | pgsql-bugs |
>>>>> "PG" == PG Bug reporting form <noreply(at)postgresql(dot)org> writes:
PG> Hi,
PG> when I use setup_regexp_matches, I found matchctx->npatterns is
PG> always 1 no matter pattern have not or one subexpr subexpression.
This isn't a bug. setup_regexp_matches is just an internal helper
function for use by regexp_match, regexp_matches, regexp_split_to_table,
and regexp_split_to_array, all of which treat the whole match as the
result if there are no subexpression captures in the regexp. npatterns
is therefore forced to be 1 in that case, so that nmatches * npatterns
is the number of position pairs returned in the match_locs array.
--
Andrew (irc:RhodiumToad)
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