How to use the generator-jhipster/generators/generator-constants.INTERPOLATE_REGEX function in generator-jhipster

*
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
const mkdirp = require('mkdirp');
const cleanup = require('generator-jhipster/generators/cleanup');
const constants = require('generator-jhipster/generators/generator-constants');
const baseServerFiles = require('generator-jhipster/generators/server/files').serverFiles;

/* Constants use throughout */
const INTERPOLATE_REGEX = constants.INTERPOLATE_REGEX;
const SERVER_MAIN_SRC_DIR = constants.SERVER_MAIN_SRC_DIR;
const SERVER_MAIN_RES_DIR = constants.SERVER_MAIN_RES_DIR;
const SERVER_TEST_SRC_DIR = constants.SERVER_TEST_SRC_DIR;
const SERVER_TEST_RES_DIR = constants.SERVER_TEST_RES_DIR;

/* TODO: Do a PR in the parent JHipster project to export and re-use here as well in order to have a single source of truth!!!
const TEST_DIR = constants.TEST_DIR;
const shouldSkipUserManagement = generator =>
    generator.skipUserManagement && (generator.applicationType !== 'monolith' || generator.authenticationType !== 'oauth2');
*/

/**
 * The default is to use a file path string. It implies use of the template method.
 * For any other config an object { file:.., method:.., template:.. } can be used
 */
const serverFiles = {

this.angularXAppName = this.getAngularXAppName();
        this.changelogDate = this.dateFormatForLiquibase();
        this.jhiPrefix = this.jhAppConfig.jhiPrefix;
        // if changelogDate for entity audit already exists then use this existing changelogDate
        const liguibaseFileName = glob.sync(`${this.jhAppConfig.resourceDir}/config/liquibase/changelog/*_added_entity_EntityAuditEvent.xml`)[0];
        if (liguibaseFileName) {
          this.changelogDate = new RegExp('/config/liquibase/changelog/(.*)_added_entity_EntityAuditEvent.xml').exec(liguibaseFileName)[1];
        }


        // use constants from generator-constants.js
        this.webappDir = jhipsterConstants.CLIENT_MAIN_SRC_DIR;
        this.javaTemplateDir = 'src/main/java/package';
        this.javaDir = `${jhipsterConstants.SERVER_MAIN_SRC_DIR + this.packageFolder}/`;
        this.resourceDir = jhipsterConstants.SERVER_MAIN_RES_DIR;
        this.interpolateRegex = jhipsterConstants.INTERPOLATE_REGEX;
      },