"Gauthier, Dave" <dave(dot)gauthier(at)intel(dot)com> writes:
> bi_hsx_a0_latest=# select regexp_replace('xxx','^xxxy$',null);
> regexp_replace
> ----------------
>
> (1 row)
> But why did it return null in this case?
regexp_replace is strict, so it never even gets called when there's
a null input.
regards, tom lane