Re: is_numeric() or extract_numeric() functions?

"Ron St.Pierre" <rstpierre@syscor.com> writes:
> CREATE OR REPLACE FUNCTION getnumber(varchar(1)) RETURNS integer AS '
>         BEGIN
>             return ($1 ~ '[0-9]');
>         END;
> ' LANGUAGE 'plpgsql';

> I get the following error:
>   parse error at or near "["

You need to double the quotes in the function body, viz

    ...
            return ($1 ~ ''[0-9]'');
    ...

Backslash-quote (\') is an alternative way.

            regards, tom lane