BUG #17352: Column CHECK regex error

The following bug has been logged on the website:

Bug reference: 17352
Logged by: Serge Salamatin
Email address: salamsp(at)gmail(dot)com
PostgreSQL version: 13.5
Operating system: Ubuntu 13.5-2.pgdg20.04+1
Description:

select '01' ~ '^[\d-]{2,8}$' -> true,

but in next

CREATE TABLE IF NOT EXISTS public.mnu
(
mnunm character(10) COLLATE pg_catalog."default" NOT NULL,
code character(8) COLLATE pg_catalog."default" NOT NULL
CONSTRAINT "Only digits" CHECK (code ~ '^[\d-]{2,8}$'),
txt citext COLLATE pg_catalog."default" NOT NULL,
ui_id bigint,
action citext COLLATE pg_catalog."default",
tip citext COLLATE pg_catalog."default",
CONSTRAINT mnu_pkey PRIMARY KEY (mnunm, code, txt)
);

INSERT INTO public.mnu (
mnunm , code , txt , ui_id , action , tip
)
OVERRIDING USER VALUE VALUES(
'p977main' , '01' , 'Tables def' , DEFAULT , '' , ''
);

returns ->

"ERROR: new row for relation "mnu" violates check constraint "Only
digits"
DETAIL: Failing row contains (p977main , 01 , Tables def, null, ,
).
SQL state: 23514"

If we drop CONSTRAINT "Only digits" that insert will be done properly.
If we change column into character varying(8) and left CONSTRAINT "Only
digits"
that insert will be done without error.