Re: PATCH: CITEXT 2.0 v4

David E. Wheeler writes:

> On Jul 17, 2008, at 03:45, Michael Paesold wrote:
>
>> Wouldn't it be possible to create a variant of regexp_replace, i.e.
>> regexp_replace(citext,citext,text), which would again lower-case
>> the first two arguments before passing the input to
>> regexp_replace(text,text,text)?
>
> Sure, but then you end up with this:
>
> template1=# select regexp_replace( 'Fxx'::citext, 'X'::citext, 'o');
> regexp_replace
> ----------------
> foo
> (1 row)

Yeah, you are right, I see. :-)

> Which is just wrong. I'm going to look at the regex C functions
> today and see if there's an easy way to just always pass them the
> 'i' flag, which would do the trick. That still won't help replace(),
> split_part(), or translate(), however.

Calling regex functions with the case-insensitivity option would be
great. It should also be possible to rewrite replace() into
regexp_replace() by first escaping the regex meta characters.

Actually re-implementing those functions in a case insensitive way
would still be an option, but of course some amount of work. The
question is, how much use case there is.

Best Regards
Michael Paesold