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By using db<>fiddle, you agree to license everything you submit by Creative Commons CC0. 2335821 fiddles created (27460 in the last week).

create table foo ( the_column varchar(20) not null, CONSTRAINT check_numbers CHECK (regexp_like(the_column, '^[67]+$')) );
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insert into foo values ('54');
ORA-02290: check constraint (FIDDLE_MZPECFQLXVKXVDSLXXEL.CHECK_NUMBERS) violated
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insert into foo values ('67776');
1 rows affected
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select * from foo;
THE_COLUMN
67776
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