Regexp functions flagged as not deterministic

[RDelg]

Hello,
I am wondering why the regexp functions are not flagged with SQLITE_INNOCUOUS and SQLITE_DETERMINISTIC.
It is giving me an error when trying to use regexp_replace in a generated column.

sqlite> .load ./re
sqlite> create table test as select "name" as name;
sqlite> alter table test add column new_name generated always as (regexp_replace(name,'.','N'));
Runtime error: error in table test after add column: non-deterministic functions prohibited in generated columns

[nalgeon]

Marked functions as deterministic in 0.15.3.