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--
-- Regular expression tests
--
-- Don't want to have to double backslashes in regexes
set standard_conforming_strings = on;
-- Test simple quantified backrefs
select 'bbbbb' ~ '^([bc])\1*$' as t;
t
---
t
(1 row)
select 'ccc' ~ '^([bc])\1*$' as t;
t
---
t
(1 row)
select 'xxx' ~ '^([bc])\1*$' as f;
f
---
f
(1 row)
select 'bbc' ~ '^([bc])\1*$' as f;
f
---
f
(1 row)
select 'b' ~ '^([bc])\1*$' as t;
t
---
t
(1 row)
-- Test quantified backref within a larger expression
select 'abc abc abc' ~ '^(\w+)( \1)+$' as t;
t
---
t
(1 row)
select 'abc abd abc' ~ '^(\w+)( \1)+$' as f;
f
---
f
(1 row)
select 'abc abc abd' ~ '^(\w+)( \1)+$' as f;
f
---
f
(1 row)
select 'abc abc abc' ~ '^(.+)( \1)+$' as t;
t
---
t
(1 row)
select 'abc abd abc' ~ '^(.+)( \1)+$' as f;
f
---
f
(1 row)
select 'abc abc abd' ~ '^(.+)( \1)+$' as f;
f
---
f
(1 row)
-- Test some cases that crashed in 9.2beta1 due to pmatch[] array overrun
select substring('asd TO foo' from ' TO (([a-z0-9._]+|"([^"]+|"")+")+)');
substring
-----------
foo
(1 row)
select substring('a' from '((a))+');
substring
-----------
a
(1 row)
select substring('a' from '((a)+)');
substring
-----------
a
(1 row)
-- Test conversion of regex patterns to indexable conditions
explain (costs off) select * from pg_proc where proname ~ 'abc';
QUERY PLAN
-----------------------------------
Seq Scan on pg_proc
Filter: (proname ~ 'abc'::text)
(2 rows)
explain (costs off) select * from pg_proc where proname ~ '^abc';
QUERY PLAN
----------------------------------------------------------------------
Index Scan using pg_proc_proname_args_nsp_index on pg_proc
Index Cond: ((proname >= 'abc'::name) AND (proname < 'abd'::name))
Filter: (proname ~ '^abc'::text)
(3 rows)
explain (costs off) select * from pg_proc where proname ~ '^abc$';
QUERY PLAN
------------------------------------------------------------
Index Scan using pg_proc_proname_args_nsp_index on pg_proc
Index Cond: (proname = 'abc'::name)
Filter: (proname ~ '^abc$'::text)
(3 rows)
explain (costs off) select * from pg_proc where proname ~ '^abcd*e';
QUERY PLAN
----------------------------------------------------------------------
Index Scan using pg_proc_proname_args_nsp_index on pg_proc
Index Cond: ((proname >= 'abc'::name) AND (proname < 'abd'::name))
Filter: (proname ~ '^abcd*e'::text)
(3 rows)
explain (costs off) select * from pg_proc where proname ~ '^abc+d';
QUERY PLAN
----------------------------------------------------------------------
Index Scan using pg_proc_proname_args_nsp_index on pg_proc
Index Cond: ((proname >= 'abc'::name) AND (proname < 'abd'::name))
Filter: (proname ~ '^abc+d'::text)
(3 rows)
explain (costs off) select * from pg_proc where proname ~ '^(abc)(def)';
QUERY PLAN
----------------------------------------------------------------------------
Index Scan using pg_proc_proname_args_nsp_index on pg_proc
Index Cond: ((proname >= 'abcdef'::name) AND (proname < 'abcdeg'::name))
Filter: (proname ~ '^(abc)(def)'::text)
(3 rows)
explain (costs off) select * from pg_proc where proname ~ '^(abc)$';
QUERY PLAN
------------------------------------------------------------
Index Scan using pg_proc_proname_args_nsp_index on pg_proc
Index Cond: (proname = 'abc'::name)
Filter: (proname ~ '^(abc)$'::text)
(3 rows)
explain (costs off) select * from pg_proc where proname ~ '^(abc)?d';
QUERY PLAN
----------------------------------------
Seq Scan on pg_proc
Filter: (proname ~ '^(abc)?d'::text)
(2 rows)
-- Test for infinite loop in pullback() (CVE-2007-4772)
select 'a' ~ '($|^)*';
?column?
----------
t
(1 row)
-- Test for infinite loop in fixempties() (Tcl bugs 3604074, 3606683)
select 'a' ~ '((((((a)*)*)*)*)*)*';
?column?
----------
t
(1 row)
select 'a' ~ '((((((a+|)+|)+|)+|)+|)+|)';
?column?
----------
t
(1 row)
-- Test backref in combination with non-greedy quantifier
-- https://core.tcl.tk/tcl/tktview/6585b21ca8fa6f3678d442b97241fdd43dba2ec0
select 'Programmer' ~ '(\w).*?\1' as t;
t
---
t
(1 row)
select regexp_matches('Programmer', '(\w)(.*?\1)', 'g');
regexp_matches
----------------
{r,ogr}
{m,m}
(2 rows)
-- Test for proper matching of non-greedy iteration (bug #11478)
select regexp_matches('foo/bar/baz',
'^([^/]+?)(?:/([^/]+?))(?:/([^/]+?))?$', '');
regexp_matches
----------------
{foo,bar,baz}
(1 row)
|
