I want to implement a quality to check audit column availability in table creation statement, i am able to do it using regex , but i want to check for specific column data types along with nullability

I have this below requirement where all 4 below column must be available in create table statement with these data type along with nullability option.
CREATEDBY character varying (50) NOT NULL,
CREATEDDTM TIMESTAMP(6) NOT NULL,
MODIFIEDBY character varying (50)
LASTMODIFIEDDTM TIMESTAMP(6)

Provide me regex which i can use to check for all these columns using quality check in liquibase