Thread: Postgres friendly RegEx?
Anyone care to correct this regex for PostgreSQL? It works in C++ but Postgres have no love for it:
-{0,1}\d*\.{0,1}\d+\^{0,1}\d*\.{0,1}\d+
This regex accepts (any num)^(pos num) such as:
45.2^3
-45.2^3
10^2.5
"Jon Asher" <jon.asher@gmail.com> writes:
> Anyone care to correct this regex for PostgreSQL? It works in C++ but
> Postgres have no love for it:
> -{0,1}\d*\.{0,1}\d+\^{0,1}\d*\.{0,1}\d+
It works fine in Postgres, AFAICT. Maybe you forgot to double the
backslashes in a string literal? Otherwise, be more specific about
your problem.
regards, tom lane
In Postgres, it appears to be returning false positives:
select * from
(select '52'::varchar As val) d
where d.val ~ '-{0,1}\\d*\\.{0,1}\\d+\\^{0,1}\\d*\\.{0,1}\\d+'
returns a record.
(select '52'::varchar As val) d
where d.val ~ '-{0,1}\\d*\\.{0,1}\\d+\\^{0,1}\\d*\\.{0,1}\\d+'
returns a record.
In C++ only such values match: 45.2^3 or -45.2^3 or 10^2.5
On 12/12/06, Tom Lane <tgl@sss.pgh.pa.us> wrote:
"Jon Asher" <jon.asher@gmail.com> writes:
> Anyone care to correct this regex for PostgreSQL? It works in C++ but
> Postgres have no love for it:
> -{0,1}\d*\.{0,1}\d+\^{0,1}\d*\.{0,1}\d+
It works fine in Postgres, AFAICT. Maybe you forgot to double the
backslashes in a string literal? Otherwise, be more specific about
your problem.
regards, tom lane
Please ignore, my mistake in the translation to Pg regex !
On 12/12/06, Jon Asher <jon.asher@gmail.com> wrote:
In Postgres, it appears to be returning false positives:select * from
(select '52'::varchar As val) d
where d.val ~ '-{0,1}\\d*\\.{0,1}\\d+\\^{0,1}\\d*\\.{0,1}\\d+'
returns a record.In C++ only such values match: 45.2^3 or -45.2^3 or 10^2.5
On 12/12/06, Tom Lane <tgl@sss.pgh.pa.us> wrote:"Jon Asher" < jon.asher@gmail.com> writes:
> Anyone care to correct this regex for PostgreSQL? It works in C++ but
> Postgres have no love for it:
> -{0,1}\d*\.{0,1}\d+\^{0,1}\d*\.{0,1}\d+
It works fine in Postgres, AFAICT. Maybe you forgot to double the
backslashes in a string literal? Otherwise, be more specific about
your problem.
regards, tom lane
You don't give a pg version.....
It looks legal to me as of 8.1.
Try replacing all the "{0,1}" with "?" - but
check the manual for "regex_flavor" too.
Is there any chance you're in "basic" mode?
- Jeremy