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* Regular Expression Matching problem...
@ 2006-01-04 14:08 Mario Splivalo <mario.splivalo@mobart.hr>
0 siblings, 1 reply; 4+ messages in thread
From: Mario Splivalo @ 2006-01-04 14:08 UTC (permalink / raw)
To: pgsql-sql
I have a table containing regular expresion patterns for matching phone
numbers with the mobile operators.
For instance, my phone number is '+385911234567', and the regexp for
this mobile operator is: "^\+38591\d{7}$".
Now, when I do a regexp match in a single select, it behaves as
expected:
octopussy2=# select '+385911234567' ~ '^\\+38591\\d{7}$';
?column?
----------
t
(1 row)
Now, as I've mentioned, I have a table with operators and their patterns
for phone numbers:
octopussy2=# select * from operators;
operator_id | operator_name | operator_phonenumber_pattern
-------------+---------------+------------------------------
1 | FreeSMSC | ^\\+38590\\d{6,7}$
2 | VipNet | ^\\+38591\\d{7}$
3 | T-Mobile | ^\\+3859[9|8]\\d{6,7}$
4 | Tele2 | ^\\+38595\\d{7}$
(4 rows)
Now, if I construct my query like this:
octopussy2=# select '+385911234567', operator_phonenumber_pattern,
'+385911234567' ~ operator_phonenumber_pattern from operators;
?column? | operator_phonenumber_pattern | ?column?
---------------+------------------------------+----------
+385911234567 | ^\\+38590\\d{6,7}$ | f
+385911234567 | ^\\+38591\\d{7}$ | f
+385911234567 | ^\\+3859[9|8]\\d{6,7}$ | f
+385911234567 | ^\\+38595\\d{7}$ | f
(4 rows)
Why do I get all the "f"'s? I tought that the operator_id 2 should
return "t", esp. when I wrote the first query it seems that the regex
match was ok.
Or I can't do regexp matching from the table columns?
Mike
--
Mario Splivalo
Mob-Art
mario.splivalo@mobart.hr
"I can do it quick, I can do it cheap, I can do it well. Pick any two."
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: Regular Expression Matching problem...
@ 2006-01-04 14:50 A. Kretschmer <andreas.kretschmer@schollglas.com>
parent: Mario Splivalo <mario.splivalo@mobart.hr>
0 siblings, 1 reply; 4+ messages in thread
From: A. Kretschmer @ 2006-01-04 14:50 UTC (permalink / raw)
To: pgsql-sql
am 04.01.2006, um 15:08:45 +0100 mailte Mario Splivalo folgendes:
> I have a table containing regular expresion patterns for matching phone
> numbers with the mobile operators.
>
> For instance, my phone number is '+385911234567', and the regexp for
> this mobile operator is: "^\+38591\d{7}$".
>
> Now, when I do a regexp match in a single select, it behaves as
> expected:
>
> octopussy2=# select '+385911234567' ~ '^\\+38591\\d{7}$';
> ?column?
> ----------
> t
> (1 row)
>
> Now, as I've mentioned, I have a table with operators and their patterns
> for phone numbers:
>
> octopussy2=# select * from operators;
> operator_id | operator_name | operator_phonenumber_pattern
> -------------+---------------+------------------------------
> 1 | FreeSMSC | ^\\+38590\\d{6,7}$
> 2 | VipNet | ^\\+38591\\d{7}$
> 3 | T-Mobile | ^\\+3859[9|8]\\d{6,7}$
> 4 | Tele2 | ^\\+38595\\d{7}$
> (4 rows)
>
>
> Now, if I construct my query like this:
>
> octopussy2=# select '+385911234567', operator_phonenumber_pattern,
> '+385911234567' ~ operator_phonenumber_pattern from operators;
>
> ?column? | operator_phonenumber_pattern | ?column?
> ---------------+------------------------------+----------
> +385911234567 | ^\\+38590\\d{6,7}$ | f
> +385911234567 | ^\\+38591\\d{7}$ | f
> +385911234567 | ^\\+3859[9|8]\\d{6,7}$ | f
> +385911234567 | ^\\+38595\\d{7}$ | f
> (4 rows)
>
>
> Why do I get all the "f"'s? I tought that the operator_id 2 should
> return "t", esp. when I wrote the first query it seems that the regex
> match was ok.
Try this:
test=# select '+385911234567', operator_phonenumber_pattern, '+385911234567' ~ replace(operator_phonenumber_pattern,'\\\\','\\') from operators;
?column? | operator_phonenumber_pattern | ?column?
---------------+------------------------------+----------
+385911234567 | ^\\+38590\\d{6,7}$ | f
+385911234567 | ^\\+38591\\d{7}$ | t
+385911234567 | ^\\+3859[9|8]\\d{6,7}$ | f
+385911234567 | ^\\+38595\\d{7}$ | f
(4 rows)
HTH, Andreas
--
Andreas Kretschmer (Kontakt: siehe Header)
Heynitz: 035242/47212, D1: 0160/7141639
GnuPG-ID 0x3FFF606C http://wwwkeys.de.pgp.net
=== Schollglas Unternehmensgruppe ===
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: Regular Expression Matching problem...
@ 2006-01-04 17:00 Michael Fuhr <mike@fuhr.org>
parent: A. Kretschmer <andreas.kretschmer@schollglas.com>
0 siblings, 1 reply; 4+ messages in thread
From: Michael Fuhr @ 2006-01-04 17:00 UTC (permalink / raw)
To: A. Kretschmer <andreas.kretschmer@schollglas.com>; pgsql-sql
On Wed, Jan 04, 2006 at 03:50:31PM +0100, A. Kretschmer wrote:
> Try this:
>
> test=# select '+385911234567', operator_phonenumber_pattern, '+385911234567' ~ replace(operator_phonenumber_pattern,'\\\\','\\') from operators;
> ?column? | operator_phonenumber_pattern | ?column?
> ---------------+------------------------------+----------
> +385911234567 | ^\\+38590\\d{6,7}$ | f
> +385911234567 | ^\\+38591\\d{7}$ | t
> +385911234567 | ^\\+3859[9|8]\\d{6,7}$ | f
> +385911234567 | ^\\+38595\\d{7}$ | f
> (4 rows)
What Andreas is saying is that the patterns in the table have too
many backslashes. The original query was
test=> select '+385911234567' ~ '^\\+38591\\d{7}$';
?column?
----------
t
(1 row)
but if you select just the pattern you get
test=> select '^\\+38591\\d{7}$';
?column?
----------------
^\+38591\d{7}$
(1 row)
which isn't what's in the table; somehow the patterns in the table
are over-escaped. You might want to read up on how backslashes are
handled in quoted strings, especially when those strings are used
as regular expressions. If you're using 8.0 or later then also
read about dollar-quoted strings.
http://www.postgresql.org/docs/8.1/interactive/sql-syntax.html#SQL-SYNTAX-STRINGS
http://www.postgresql.org/docs/8.1/interactive/functions-matching.html#FUNCTIONS-POSIX-REGEXP
(Use the documentation for whatever version of PostgreSQL you're
running; the above links have some comments that apply only to 8.1
and future versions).
--
Michael Fuhr
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: Regular Expression Matching problem...
@ 2006-01-09 01:22 Mario Splivalo <mario.splivalo@mobart.hr>
parent: Michael Fuhr <mike@fuhr.org>
0 siblings, 0 replies; 4+ messages in thread
From: Mario Splivalo @ 2006-01-09 01:22 UTC (permalink / raw)
To: pgsql-sql
On Wed, 2006-01-04 at 10:00 -0700, Michael Fuhr wrote:
> What Andreas is saying is that the patterns in the table have too
> many backslashes. The original query was
>
> test=> select '+385911234567' ~ '^\\+38591\\d{7}$';
> ?column?
> ----------
> t
> (1 row)
>
> but if you select just the pattern you get
>
> test=> select '^\\+38591\\d{7}$';
> ?column?
> ----------------
> ^\+38591\d{7}$
> (1 row)
I was a bit silly here. Dunno why I tought I need to escape the
backslashes when entering regexp as data in table. Thank you for
pointing that out.
Mike
^ permalink raw reply [nested|flat] 4+ messages in thread
end of thread, other threads:[~2006-01-09 01:22 UTC | newest]
Thread overview: 4+ messages (download: mbox mbox.gz follow: Atom feed)
-- links below jump to the message on this page --
2006-01-04 14:08 Regular Expression Matching problem... Mario Splivalo <mario.splivalo@mobart.hr>
2006-01-04 14:50 ` A. Kretschmer <andreas.kretschmer@schollglas.com>
2006-01-04 17:00 ` Michael Fuhr <mike@fuhr.org>
2006-01-09 01:22 ` Mario Splivalo <mario.splivalo@mobart.hr>
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