diff options
| author | Tom Lane <tgl@sss.pgh.pa.us> | 2016-08-17 18:32:56 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2016-08-17 18:33:01 -0400 |
| commit | cf9b0fea5f6d1bcc9b2c66f5c30ecb04684a0919 (patch) | |
| tree | 37757fd2bb978cdd4837168e61340ddd7f33de04 /src/backend/access/gist/gistutil.c | |
| parent | 2d7e591007a6f44e5e27e2b6c1098483105c0d10 (diff) | |
| download | postgresql-cf9b0fea5f6d1bcc9b2c66f5c30ecb04684a0919.tar.gz | |
Implement regexp_match(), a simplified alternative to regexp_matches().
regexp_match() is like regexp_matches(), but it disallows the 'g' flag
and in consequence does not need to return a set. Instead, it returns
a simple text array value, or NULL if there's no match. Previously people
usually got that behavior with a sub-select, but this way is considerably
more efficient.
Documentation adjusted so that regexp_match() is presented first and then
regexp_matches() is introduced as a more complicated version. This is
a bit historically revisionist but seems pedagogically better.
Still TODO: extend contrib/citext to support this function.
Emre Hasegeli, reviewed by David Johnston
Discussion: <CAE2gYzy42sna2ME_e3y1KLQ-4UBrB-eVF0SWn8QG39sQSeVhEw@mail.gmail.com>
Diffstat (limited to 'src/backend/access/gist/gistutil.c')
0 files changed, 0 insertions, 0 deletions