How to use the regenerate function in regenerate

*
 * 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.
 */

// @ts-ignore
import regenerate from 'regenerate';
import stripAnsi from 'strip-ansi';

// create a regular expression using regenerate() that selects any character that is explicitly allowed by https://www.w3.org/TR/xml/#NT-Char
const validXmlCharsRE = new RegExp(
  `(?:${regenerate()
    .add(0x9, 0xa, 0xd)
    .addRange(0x20, 0xd7ff)
    .addRange(0xe000, 0xfffd)
    .addRange(0x10000, 0x10ffff)
    .toString()})*`,
  'g'
);

export function escapeCdata(input: string) {
  const match = stripAnsi(input).match(validXmlCharsRE) || [];
  return match.join('');
}