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Add three new regexp functions: regexp_matches, regexp_split_to_array,

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and regexp_split_to_table. These functions provide access to the
capture groups resulting from a POSIX regular expression match,
and provide the ability to split a string on a POSIX regular
expression, respectively. Patch from Jeremy Drake; code review by
Neil Conway, additional comments and suggestions from Tom and
Peter E.

This patch bumps the catversion, adds some regression tests,
and updates the docs.
This commit is contained in:
Neil Conway
2007-03-20 05:45:00 +00:00
parent 5e96b04a7c
commit 9eb78beeae
7 changed files with 1005 additions and 74 deletions
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53
src/test/regress/sql/strings.sql
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@@ -85,9 +85,60 @@ SELECT regexp_replace('1112223333', E'(\\d{3})(\\d{3})(\\d{4})', E'(\\1) \\2-\\3
SELECT regexp_replace('AAA BBB CCC ', E'\\s+', ' ', 'g');
SELECT regexp_replace('AAA', '^|$', 'Z', 'g');
SELECT regexp_replace('AAA aaa', 'A+', 'Z', 'gi');
-- invalid option of REGEXP_REPLACE
-- invalid regexp option
SELECT regexp_replace('AAA aaa', 'A+', 'Z', 'z');
-- set so we can tell NULL from empty string
\pset null '\\N'
-- return all matches from regexp
SELECT regexp_matches('foobarbequebaz', $re$(bar)(beque)$re$);
-- test case insensitive
SELECT regexp_matches('foObARbEqUEbAz', $re$(bar)(beque)$re$, 'i');
-- global option - more than one match
SELECT regexp_matches('foobarbequebazilbarfbonk', $re$(b[^b]+)(b[^b]+)$re$, 'g');
-- empty capture group (matched empty string)
SELECT regexp_matches('foobarbequebaz', $re$(bar)(.*)(beque)$re$);
-- no match
SELECT regexp_matches('foobarbequebaz', $re$(bar)(.+)(beque)$re$);
-- optional capture group did not match, null entry in array
SELECT regexp_matches('foobarbequebaz', $re$(bar)(.+)?(beque)$re$);
-- no capture groups
SELECT regexp_matches('foobarbequebaz', $re$barbeque$re$);
-- give me errors
SELECT regexp_matches('foobarbequebaz', $re$(bar)(beque)$re$, 'zipper');
SELECT regexp_matches('foobarbequebaz', $re$(barbeque$re$);
SELECT regexp_matches('foobarbequebaz', $re$(bar)(beque){2,1}$re$);
-- split string on regexp
SELECT foo, length(foo) FROM regexp_split_to_table('the quick brown fox jumped over the lazy dog', $re$\s+$re$) AS foo;
SELECT regexp_split_to_array('the quick brown fox jumped over the lazy dog', $re$\s+$re$);
SELECT foo, length(foo) FROM regexp_split_to_table('the quick brown fox jumped over the lazy dog', $re$\s*$re$) AS foo;
SELECT regexp_split_to_array('the quick brown fox jumped over the lazy dog', $re$\s*$re$);
SELECT foo, length(foo) FROM regexp_split_to_table('the quick brown fox jumped over the lazy dog', '') AS foo;
SELECT regexp_split_to_array('the quick brown fox jumped over the lazy dog', '');
-- case insensitive
SELECT foo, length(foo) FROM regexp_split_to_table('thE QUick bROWn FOx jUMPed ovEr THE lazy dOG', 'e', 'i') AS foo;
SELECT regexp_split_to_array('thE QUick bROWn FOx jUMPed ovEr THE lazy dOG', 'e', 'i');
-- no match of pattern
SELECT foo, length(foo) FROM regexp_split_to_table('the quick brown fox jumped over the lazy dog', 'nomatch') AS foo;
SELECT regexp_split_to_array('the quick brown fox jumped over the lazy dog', 'nomatch');
-- errors
SELECT foo, length(foo) FROM regexp_split_to_table('thE QUick bROWn FOx jUMPed ovEr THE lazy dOG', 'e', 'zippy') AS foo;
SELECT regexp_split_to_array('thE QUick bROWn FOx jUMPed ovEr THE lazy dOG', 'e', 'zippy');
-- global option meaningless for regexp_split
SELECT foo, length(foo) FROM regexp_split_to_table('thE QUick bROWn FOx jUMPed ovEr THE lazy dOG', 'e', 'g') AS foo;
SELECT regexp_split_to_array('thE QUick bROWn FOx jUMPed ovEr THE lazy dOG', 'e', 'g');
-- change NULL-display back
\pset null ''
-- E021-11 position expression
SELECT POSITION('4' IN '1234567890') = '4' AS "4";