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Re: Quering by Regular Expressions stored in table

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Oops, I apoligize for the noise, this does seem to be working. I had an invalid regular expression in the column.

Allen

Allen Fair wrote:
Hi! I have a table with a character column (called match_regex) containing a POSIX regular expression, hoping to have Postgres use it while evaluating the "where" predicate. The following error occurs:

SELECT *
from patterns
where 'blah blah blah' ~ match_regex;

ERROR:  invalid regular expression: quantifier operand invalid

We are using Postgres 7.4.8. I just tried the above on Postgres 8.0.4 and it seems to work! Is there a way to do this on my older version? If not, maybe I can leverage this to get Postgres upgraded ;-)

Is seems that I need a regular expression type on the right of the operator. Perhaps I can cast this 'character varying(100) column' to a regular expression type if there is such a thing... though I have not found one in the docs?
  where 'blah blah blah' ~ match_regex::regularexpression;

Thanks,
Allen





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