From: Tena Sakai <tsakai@gallo.ucsf.edu>
To: Pavel Stehule <pavel.stehule@gmail.com>
Cc: pgsql-sql@postgresql.org <pgsql-sql@postgresql.org>
Subject: Re: please help me on regular expression
Date: Tue, 2 Feb 2010 15:16:51 -0800
Message-ID: <C78DF43F.91CA%tsakai@gallo.ucsf.edu> (raw)
In-Reply-To: <162867791002021238j31ad8d7cge44bbce28ff451f3@mail.gmail.com>
Thank you kindly, Pavel.
Regards,
Tena Sakai
On 2/2/10 12:38 PM, "Pavel Stehule" <pavel.stehule@gmail.com> wrote:
> 2010/2/2 Tena Sakai <tsakai@gallo.ucsf.edu>:
>> Hi everybody,
>>
>> I need a bit of help on postgres reqular expression.
>> With a table of the following definition:
>>
>> Table "tsakai.pheno"
>> Column | Type | Modifiers
>> -----------+-------------------+-----------
>> subjectid | integer | not null
>> height | character varying | not null
>> race | character varying | not null
>> blood | character varying | not null
>>
>> I want to catch entries in height column that includes a
>> decimal point. Here's my attempt:
>>
>> select subjectid, height
>> from tsakai.pheno
>> where height ~ '[:digit:]+.[:digit:]+';
>>
>> Which returns 0 rows, but if I get rid of where clause,
>> I get rows like:
>>
>> subjectid | height
>> -----------+--------
>> 55379 | 70.5
>> 55383 | 69
>> 55395 | 70
>> 56173 | 71
>> 56177 | 65.5
>> 56178 | 70
>> . .
>> . .
>>
>> And when I escape that dot after first plus sign with a backslash,
>> like this:
>> where height ~ '[:digit:]+\.[:digit:]+';
>> then I get complaint:
>>
>> WARNING: nonstandard use of escape in a string literal
>> LINE 3: where height ~ '[:digit:]+\.[:digit:]+';
>> ^
>> HINT: Use the escape string syntax for escapes, e.g., E'\r\n'.
>>
>> From there, it was a downward spiral descent...
>>
>
> you have to use a prefix 'E' - E'some string with \backslash'
>
> for your case the reg. expr could be
>
> postgres=# select '70.5' ~ e'\\d+\.\\d+';
> ?column?
> ----------
> t
> (1 row)
>
> http://www.postgresql.org/docs/8.1/static/functions-matching.html
>
> or
>
> postgres=# select '70.5' ~ e'[[:digit:]]+\.[[:digit:]]+';
> ?column?
> ----------
> t
> (1 row)
>
> Regards
> Pavel Stehule
>> Please help.
>>
>> Thank you.
>>
>> Regards,
>>
>> Tena Sakai
>> tsakai@gallo.ucsf.edu
>>
>>
>>
>> --
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>>
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To: pgsql-sql@postgresql.org
Cc: tsakai@gallo.ucsf.edu, pavel.stehule@gmail.com
Subject: Re: please help me on regular expression
In-Reply-To: <C78DF43F.91CA%tsakai@gallo.ucsf.edu>
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