Querying an array of strings with a string that represents search terms
1
I have an array of values like:
array ('hello world', 'foo', 'bar') -- terms here have only letters and one space at most
and some text like: 'foo hello-world hello1world'
and I would like to get back from the original array the values foo and hello world filtering out bar.
Is there any way to get that with Postgres?
postgresql array string-splitting string-searching
edited Sep 25 '17 at 17:00
Evan Carroll
32.5k970221
asked Sep 25 '17 at 16:10
RandomizeRandomize
476215
bumped to the homepage by Community♦ 18 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
1
I have an array of values like:
array ('hello world', 'foo', 'bar') -- terms here have only letters and one space at most
and some text like: 'foo hello-world hello1world'
and I would like to get back from the original array the values foo and hello world filtering out bar.
Is there any way to get that with Postgres?
postgresql array string-splitting string-searching
edited Sep 25 '17 at 17:00
Evan Carroll
32.5k970221
asked Sep 25 '17 at 16:10
RandomizeRandomize
476215
bumped to the homepage by Community♦ 18 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
How do you expecthelloXworldto matchhello worldthere is anXin it? How do we know what characters you permit? What abouthellosworld?
– Evan Carroll
Sep 25 '17 at 16:18
you are right sorry :) I changed it with a number.
– Randomize
Sep 25 '17 at 16:24
That's still really weird. how come you wanthello1worldto matchhello world
– Evan Carroll
Sep 25 '17 at 16:30
If you are interested in more fuzzy matching, Pavel Stěhule has a LIKE version using arrays at postgres.cz/wiki/PostgreSQL_SQL_Tricks#LIKE_to_list_of_patterns
– bma
Sep 25 '17 at 18:37
add a comment |
1
1
1
I have an array of values like:
array ('hello world', 'foo', 'bar') -- terms here have only letters and one space at most
and some text like: 'foo hello-world hello1world'
and I would like to get back from the original array the values foo and hello world filtering out bar.
Is there any way to get that with Postgres?
postgresql array string-splitting string-searching
edited Sep 25 '17 at 17:00
Evan Carroll
32.5k970221
asked Sep 25 '17 at 16:10
RandomizeRandomize
476215
I have an array of values like:
array ('hello world', 'foo', 'bar') -- terms here have only letters and one space at most
and some text like: 'foo hello-world hello1world'
and I would like to get back from the original array the values foo and hello world filtering out bar.
Is there any way to get that with Postgres?
postgresql array string-splitting string-searching
postgresql array string-splitting string-searching
edited Sep 25 '17 at 17:00
Evan Carroll
32.5k970221
asked Sep 25 '17 at 16:10
RandomizeRandomize
476215
edited Sep 25 '17 at 17:00
Evan Carroll
32.5k970221
asked Sep 25 '17 at 16:10
RandomizeRandomize
476215
edited Sep 25 '17 at 17:00
Evan Carroll
32.5k970221
edited Sep 25 '17 at 17:00
Evan Carroll
32.5k970221
edited Sep 25 '17 at 17:00
Evan Carroll
32.5k970221
32.5k970221
asked Sep 25 '17 at 16:10
RandomizeRandomize
476215
asked Sep 25 '17 at 16:10
RandomizeRandomize
476215
asked Sep 25 '17 at 16:10
RandomizeRandomize
476215
476215
bumped to the homepage by Community♦ 18 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
bumped to the homepage by Community♦ 18 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
How do you expecthelloXworldto matchhello worldthere is anXin it? How do we know what characters you permit? What abouthellosworld?
– Evan Carroll
Sep 25 '17 at 16:18
you are right sorry :) I changed it with a number.
– Randomize
Sep 25 '17 at 16:24
That's still really weird. how come you wanthello1worldto matchhello world
– Evan Carroll
Sep 25 '17 at 16:30
If you are interested in more fuzzy matching, Pavel Stěhule has a LIKE version using arrays at postgres.cz/wiki/PostgreSQL_SQL_Tricks#LIKE_to_list_of_patterns
– bma
Sep 25 '17 at 18:37
add a comment |
How do you expecthelloXworldto matchhello worldthere is anXin it? How do we know what characters you permit? What abouthellosworld?
– Evan Carroll
Sep 25 '17 at 16:18
you are right sorry :) I changed it with a number.
– Randomize
Sep 25 '17 at 16:24
That's still really weird. how come you wanthello1worldto matchhello world
– Evan Carroll
Sep 25 '17 at 16:30
If you are interested in more fuzzy matching, Pavel Stěhule has a LIKE version using arrays at postgres.cz/wiki/PostgreSQL_SQL_Tricks#LIKE_to_list_of_patterns
– bma
Sep 25 '17 at 18:37
How do you expect
helloXworld to match hello world there is an X in it? How do we know what characters you permit? What about hellosworld?– Evan Carroll
Sep 25 '17 at 16:18
How do you expect
helloXworld to match hello world there is an X in it? How do we know what characters you permit? What about hellosworld?– Evan Carroll
Sep 25 '17 at 16:18
you are right sorry :) I changed it with a number.
– Randomize
Sep 25 '17 at 16:24
you are right sorry :) I changed it with a number.
– Randomize
Sep 25 '17 at 16:24
That's still really weird. how come you want
hello1world to match hello world– Evan Carroll
Sep 25 '17 at 16:30
That's still really weird. how come you want
hello1world to match hello world– Evan Carroll
Sep 25 '17 at 16:30
If you are interested in more fuzzy matching, Pavel Stěhule has a LIKE version using arrays at postgres.cz/wiki/PostgreSQL_SQL_Tricks#LIKE_to_list_of_patterns
– bma
Sep 25 '17 at 18:37
If you are interested in more fuzzy matching, Pavel Stěhule has a LIKE version using arrays at postgres.cz/wiki/PostgreSQL_SQL_Tricks#LIKE_to_list_of_patterns
– bma
Sep 25 '17 at 18:37
add a comment |
1 Answer
1
active
oldest
votes
0
I would do something like this,
- create a helper function to generate your query terms from the text-string input. You could inline this into the function, but it's ugly and silly and if you need it here then you probably need it elsewhere.
- Write a query with
NOT word LIKE ANY()
Here is a demo of the helper function,
CREATE OR REPLACE FUNCTION my_stupid_query(q text)
RETURNS text AS $$
SELECT ARRAY(
SELECT regexp_replace(t, '[^[:alpha:]]', '_', 'g')
FROM unnest(string_to_array(q, ' ')) AS q(t)
);
$$ LANGUAGE sql
IMMUTABLE;
Then you can use NOT word LIKE ANY(). This shows what it would look like,
SELECT word
FROM (VALUES (ARRAY['hello world', 'foo', 'bar'])) AS t1(x)
CROSS JOIN LATERAL unnest(x) AS t2(word)
WHERE NOT word LIKE ANY(my_stupid_query('foo hello-world helloXworld'));
word
------
bar
(1 row)
answered Sep 25 '17 at 16:44
Evan CarrollEvan Carroll
32.5k970221
add a comment |
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0
I would do something like this,
- create a helper function to generate your query terms from the text-string input. You could inline this into the function, but it's ugly and silly and if you need it here then you probably need it elsewhere.
- Write a query with
NOT word LIKE ANY()
Here is a demo of the helper function,
CREATE OR REPLACE FUNCTION my_stupid_query(q text)
RETURNS text AS $$
SELECT ARRAY(
SELECT regexp_replace(t, '[^[:alpha:]]', '_', 'g')
FROM unnest(string_to_array(q, ' ')) AS q(t)
);
$$ LANGUAGE sql
IMMUTABLE;
Then you can use NOT word LIKE ANY(). This shows what it would look like,
SELECT word
FROM (VALUES (ARRAY['hello world', 'foo', 'bar'])) AS t1(x)
CROSS JOIN LATERAL unnest(x) AS t2(word)
WHERE NOT word LIKE ANY(my_stupid_query('foo hello-world helloXworld'));
word
------
bar
(1 row)
answered Sep 25 '17 at 16:44
Evan CarrollEvan Carroll
32.5k970221
add a comment |
0
I would do something like this,
- create a helper function to generate your query terms from the text-string input. You could inline this into the function, but it's ugly and silly and if you need it here then you probably need it elsewhere.
- Write a query with
NOT word LIKE ANY()
Here is a demo of the helper function,
CREATE OR REPLACE FUNCTION my_stupid_query(q text)
RETURNS text AS $$
SELECT ARRAY(
SELECT regexp_replace(t, '[^[:alpha:]]', '_', 'g')
FROM unnest(string_to_array(q, ' ')) AS q(t)
);
$$ LANGUAGE sql
IMMUTABLE;
Then you can use NOT word LIKE ANY(). This shows what it would look like,
SELECT word
FROM (VALUES (ARRAY['hello world', 'foo', 'bar'])) AS t1(x)
CROSS JOIN LATERAL unnest(x) AS t2(word)
WHERE NOT word LIKE ANY(my_stupid_query('foo hello-world helloXworld'));
word
------
bar
(1 row)
answered Sep 25 '17 at 16:44
Evan CarrollEvan Carroll
32.5k970221
add a comment |
0
0
0
I would do something like this,
- create a helper function to generate your query terms from the text-string input. You could inline this into the function, but it's ugly and silly and if you need it here then you probably need it elsewhere.
- Write a query with
NOT word LIKE ANY()
Here is a demo of the helper function,
CREATE OR REPLACE FUNCTION my_stupid_query(q text)
RETURNS text AS $$
SELECT ARRAY(
SELECT regexp_replace(t, '[^[:alpha:]]', '_', 'g')
FROM unnest(string_to_array(q, ' ')) AS q(t)
);
$$ LANGUAGE sql
IMMUTABLE;
Then you can use NOT word LIKE ANY(). This shows what it would look like,
SELECT word
FROM (VALUES (ARRAY['hello world', 'foo', 'bar'])) AS t1(x)
CROSS JOIN LATERAL unnest(x) AS t2(word)
WHERE NOT word LIKE ANY(my_stupid_query('foo hello-world helloXworld'));
word
------
bar
(1 row)
answered Sep 25 '17 at 16:44
Evan CarrollEvan Carroll
32.5k970221
I would do something like this,
- create a helper function to generate your query terms from the text-string input. You could inline this into the function, but it's ugly and silly and if you need it here then you probably need it elsewhere.
- Write a query with
NOT word LIKE ANY()
Here is a demo of the helper function,
CREATE OR REPLACE FUNCTION my_stupid_query(q text)
RETURNS text AS $$
SELECT ARRAY(
SELECT regexp_replace(t, '[^[:alpha:]]', '_', 'g')
FROM unnest(string_to_array(q, ' ')) AS q(t)
);
$$ LANGUAGE sql
IMMUTABLE;
Then you can use NOT word LIKE ANY(). This shows what it would look like,
SELECT word
FROM (VALUES (ARRAY['hello world', 'foo', 'bar'])) AS t1(x)
CROSS JOIN LATERAL unnest(x) AS t2(word)
WHERE NOT word LIKE ANY(my_stupid_query('foo hello-world helloXworld'));
word
------
bar
(1 row)
answered Sep 25 '17 at 16:44
Evan CarrollEvan Carroll
32.5k970221
edited Sep 25 '17 at 17:05
answered Sep 25 '17 at 16:44
Evan CarrollEvan Carroll
32.5k970221
answered Sep 25 '17 at 16:44
Evan CarrollEvan Carroll
32.5k970221
answered Sep 25 '17 at 16:44
Evan CarrollEvan Carroll
32.5k970221
32.5k970221
add a comment |
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How do you expect
helloXworldto matchhello worldthere is anXin it? How do we know what characters you permit? What abouthellosworld?– Evan Carroll
Sep 25 '17 at 16:18
you are right sorry :) I changed it with a number.
– Randomize
Sep 25 '17 at 16:24
That's still really weird. how come you want
hello1worldto matchhello world– Evan Carroll
Sep 25 '17 at 16:30
If you are interested in more fuzzy matching, Pavel Stěhule has a LIKE version using arrays at postgres.cz/wiki/PostgreSQL_SQL_Tricks#LIKE_to_list_of_patterns
– bma
Sep 25 '17 at 18:37