Re: please help me on regular expression

Thank you kindly, Pavel.

Regards,

Tena Sakai

On 2/2/10 12:38 PM, "Pavel Stehule" <pavel(dot)stehule(at)gmail(dot)com> wrote:

> 2010/2/2 Tena Sakai <tsakai(at)gallo(dot)ucsf(dot)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(at)gallo(dot)ucsf(dot)edu
>>
>>
>>
>> --
>> Sent via pgsql-sql mailing list (pgsql-sql(at)postgresql(dot)org)
>> To make changes to your subscription:
>> http://www.postgresql.org/mailpref/pgsql-sql
>>