get a list of strings that corresponds to the subject regular expression constraints from a jaxb certificateconstraintstype concode_field_sep PlaceHolder placeHolder concode_field_sep List<String> getIssuerConstraints concode_elem_sep CertConstraints createCertConstraints concode_elem_sep CertConstraints.Combinator getSubjectConstraintsCombinator concode_elem_sep CertConstraints.Combinator getIssuerConstraintsCombinator