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* Reverse pattern match.
@ 2003-08-18 07:05 Moonstruck <bogus.email@pls-relpy-to.group>
0 siblings, 2 replies; 4+ messages in thread
From: Moonstruck @ 2003-08-18 07:05 UTC (permalink / raw)
To: pgsql-sql
I want to create a table of regular expression patterns (for assessing
phone numbers), something like:
CREATE TABLE CallType ( pattern varchar primary key,
type varchar,
rate int4);
INSERT INTO CallType VALUES ('0[3-9]________','Interstate Call',50);
INSERT INTO CallType VALUES ('9_______','Local Call',25);
INSERT INTO CallType VALUES ('0011__________%','International Call',100);
Then determine call types, based on a match, something like:
PhoneNumber := '99116633';
SELECT type, rate FROM CallType where pattern LIKE PhoneNumber;
(Sorry about the pseudo-code), but you get the gist. The query returns a
calltype description and a call rate based on the comparison of the actual
phone-number to a table of RE patterns.
I can't get my head around a way to do this, can anyone help?
Guy
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: Reverse pattern match.
@ 2003-08-18 23:05 Rod Taylor <rbt@rbt.ca>
parent: Moonstruck <bogus.email@pls-relpy-to.group>
1 sibling, 0 replies; 4+ messages in thread
From: Rod Taylor @ 2003-08-18 23:05 UTC (permalink / raw)
To: Moonstruck <bogus.email@pls-relpy-to.group>; +Cc: pgsql-sql
On Mon, 2003-08-18 at 03:05, Moonstruck wrote:
> I want to create a table of regular expression patterns (for assessing
> phone numbers), something like:
> CREATE TABLE CallType ( pattern varchar primary key,
> type varchar,
> rate int4);
> INSERT INTO CallType VALUES ('0[3-9]________','Interstate Call',50);
> INSERT INTO CallType VALUES ('9_______','Local Call',25);
> INSERT INTO CallType VALUES ('0011__________%','International Call',100);
>
> Then determine call types, based on a match, something like:
>
>
> PhoneNumber := '99116633';
> SELECT type, rate FROM CallType where pattern LIKE PhoneNumber;
SELECT type, rate FROM CallType WHERE PhoneNumber ~ pattern;
Attachments:
signature.asc (application/pgp-signature, 186B) download
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: Reverse pattern match.
@ 2003-08-18 23:11 Josh Berkus <josh@agliodbs.com>
parent: Moonstruck <bogus.email@pls-relpy-to.group>
1 sibling, 1 reply; 4+ messages in thread
From: Josh Berkus @ 2003-08-18 23:11 UTC (permalink / raw)
To: Moonstruck <bogus.email@pls-relpy-to.group>; pgsql-sql
Moonstruck,
> I want to create a table of regular expression patterns (for assessing
> phone numbers), something like:
> CREATE TABLE CallType ( pattern varchar primary key,
> type varchar,
> rate int4);
> INSERT INTO CallType VALUES ('0[3-9]________','Interstate Call',50);
> INSERT INTO CallType VALUES ('9_______','Local Call',25);
> INSERT INTO CallType VALUES ('0011__________%','International Call',100);
PostgreSQL supports real Regular Expressions, via the ~ operator. See "~"
under "functions and operators", and then consult your favorite book or
online ressouce on how to compose regexps.
An example of "is not in 415 area code" would be
phone_no ~ '^415\d{7}'
which should be "415" at the beginning followed by at least 7 other digits.
(Folks, please correct my regex code if it's bad!)
The disadvantage to this approach is that it cannot be indexed.
--
-Josh Berkus
Aglio Database Solutions
San Francisco
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: Reverse pattern match.
@ 2003-08-20 06:42 Moonstruck <bogus.email@pls-relpy-to.group>
parent: Josh Berkus <josh@agliodbs.com>
0 siblings, 0 replies; 4+ messages in thread
From: Moonstruck @ 2003-08-20 06:42 UTC (permalink / raw)
To: pgsql-sql
Many thanks... got it now.
Example...
sox=# select * from regexpatt;
pattern | description
---------+------------------------------------
^b | starts with a B
^a | starts with an A
^c.*l$ | starts with a C and ends with an L
(3 rows)
sox=# select description from regexpatt where 'bravo' ~ pattern;
description
----------------
starts with a B
(1 row)
sox=# select description from regexpatt where 'caramel' ~ pattern;
description
------------------------------------
starts with a C and ends with an L
(1 row)
"Josh Berkus" <josh@agliodbs.com> wrote in message
news:200308181611.27937.josh@agliodbs.com...
Moonstruck,
> I want to create a table of regular expression patterns (for assessing
> phone numbers), something like:
> CREATE TABLE CallType ( pattern varchar primary key,
> type varchar,
> rate int4);
> INSERT INTO CallType VALUES ('0[3-9]________','Interstate Call',50);
> INSERT INTO CallType VALUES ('9_______','Local Call',25);
> INSERT INTO CallType VALUES ('0011__________%','International Call',100);
PostgreSQL supports real Regular Expressions, via the ~ operator. See "~"
under "functions and operators", and then consult your favorite book or
online ressouce on how to compose regexps.
An example of "is not in 415 area code" would be
phone_no ~ '^415\d{7}'
which should be "415" at the beginning followed by at least 7 other digits.
(Folks, please correct my regex code if it's bad!)
The disadvantage to this approach is that it cannot be indexed.
--
-Josh Berkus
Aglio Database Solutions
San Francisco
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2003-08-18 07:05 Reverse pattern match. Moonstruck <bogus.email@pls-relpy-to.group>
2003-08-18 23:05 ` Rod Taylor <rbt@rbt.ca>
2003-08-18 23:11 ` Josh Berkus <josh@agliodbs.com>
2003-08-20 06:42 ` Moonstruck <bogus.email@pls-relpy-to.group>
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