REGEXP_REPLACE fails in Check Constraint in 12.2

We have check constraints that use the function REGEXP_REPLACE.  They worked fine in the past but after the upgrade to 12.2 when we try to add them we get errors:

ORA-39083: Object type CONSTRAINT:"MY_TABLE" failed to create with error:

ORA-02436: date or system variable wrongly specified in CHECK constraint

Failing sql is:

ALTER TABLE "MY_TABLE" ADD CONSTRAINT "MY_CONSTRAINT" CHECK (REGEXP_REPLACE(CMD_PARAMETER_NAME,'["0-9a-zA-Z*+&/:#_.-]*') IS NULL) ENABLE

Does 12.2 not allow the use of the REGEXP_REPLACE function in check constraints?

Have the allowed regular experssions changed with 12.2?

thanks,

Michael