Re: Reverse pattern match.

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

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;

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

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(at)agliodbs(dot)com> wrote in message
news:200308181611(dot)27937(dot)josh(at)agliodbs(dot)com(dot)(dot)(dot)
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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I'mm trying to debug something inside my PLSQL routine. How do I print
out error messages from inside my function?

Thanks,

Drew

On Thu, Aug 21, 2003 at 05:21:47PM -0700, Drew Wilson wrote:
> I'mm trying to debug something inside my PLSQL routine. How do I print
> out error messages from inside my function?

RAISE NOTICE ''Foobar is %'', foobar;

Where "foobar" is a variable. The documentation mentions this in several
places and examples.

-Roberto

--
+----| Roberto Mello - http://www.brasileiro.net/ |------+
+ Computer Science Graduate Student, Utah State University +
+ USU Free Software & GNU/Linux Club - http://fslc.usu.edu/ +
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