Trying to hide certain columns based on the user logged in and running into issues with the policy function. The value I’m trying to filter is stored in this format – ” |1234| “and I need to exclude it. Appreciate input on how to filter the value in the above format. Thanks!

BEGIN
    DBMS_RLS.drop_POLICY (object_schema   => 'Schema1',
                          object_name     => 'RT_TABLE',
                          policy_name     => 'AUDIT_DOMAINSECURE');
END;

CREATE OR REPLACE FUNCTION AUDITDOMAIN_SECURE_FNC (p_schema   VARCHAR2,
                                                   p_obj      VARCHAR2)
    RETURN VARCHAR2
AS
    l_user        VARCHAR2 (20);
    l_predicate   VARCHAR2 (100);
BEGIN
    SELECT USER INTO l_user FROM DUAL;

    IF l_user NOT IN ('TOM')
    THEN
        l_predicate := 'DOMAIN != |3721|';
    END IF;

    RETURN l_predicate;
END AUDITDOMAIN_SECURE_FNC;


BEGIN
    DBMS_RLS.add_policy (object_schema       => 'SCHEMA1' -- specify the schema containing the object
                                                         ,
                         object_name         => 'RT_TABLE' -- specify the object name within the schema.
                                                          ,
                         policy_name         => 'AUDIT_DOMAINSECURE' -- specify the policy name. Policy name is unique for an object.
                                                                    ,
                         function_schema     => 'SCHEMA1' -- specify the schema in which the policy function is created
                                                         ,
                         policy_function     => 'AUDITDOMAIN_SECURE_FNC' -- specify the name of the policy function
                                                                        ,
                         statement_Types     => 'SELECT' -- Operations when this policy applies. SELECT
                                                        ,
                         sec_relevant_cols   => 'DOMAIN,TABLE_ID' -- ALL relevant columns to be hidden from users
                                                                 --  ,sec_relevant_cols_opt=> dbms_rls.ALL_ROWS
                                                                 );
END;