// Obtain HKIDValidator.
final hkidValidator = HKIDValidator();

// Check is HKID Validate or not; HKID - U443902 wuth Specific Character 0
bool isIdValid = HKIDValidator().isHKIDValid('U443902', '0');

// Generate the Random Validate HKID with Eight or Nine digits
String hkid = HKIDValidator().genRanValidHKID(isEight: true);

// Generate the Validate HKID with eight number
String hkid = HKIDValidator().genValidHKID(isEight: true);

// Generate the Validate HKID with Nine number
String hkid = HKIDValidator().genValidHKID(isEight: false);```

String hkid = hkid.withPARES();