Oracle 11g Release 2

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

insert into foo values ('67776');
1 rows affected

select *
from foo;


THE_COLUMN


67776