18 files declare their use of Validator in Form API Validation 8.2

AlphaDashValidator.php in src/Plugin/FapiValidationValidator/AlphaDashValidator.php

AlphaNumericValidator.php in src/Plugin/FapiValidationValidator/AlphaNumericValidator.php

AlphaValidator.php in src/Plugin/FapiValidationValidator/AlphaValidator.php

AlphaValidatorTest.php in tests/src/Unit/Validators/AlphaValidatorTest.php

CharsValidator.php in src/Plugin/FapiValidationValidator/CharsValidator.php

DecimalValidator.php in src/Plugin/FapiValidationValidator/DecimalValidator.php

DecimalValidatorTest.php in tests/src/Unit/Validators/DecimalValidatorTest.php

DigitValidator.php in src/Plugin/FapiValidationValidator/DigitValidator.php

EmailValidator.php in src/Plugin/FapiValidationValidator/EmailValidator.php

Ipv4Validator.php in src/Plugin/FapiValidationValidator/Ipv4Validator.php

LengthValidator.php in src/Plugin/FapiValidationValidator/LengthValidator.php

LimitDecimalsValidator.php in src/Plugin/FapiValidationValidator/LimitDecimalsValidator.php

MatchFieldValidator.php in src/Plugin/FapiValidationValidator/MatchFieldValidator.php

MyCustomValidator.php in fapiv_example/src/Plugin/FapiValidationValidator/MyCustomValidator.php

NumericValidator.php in src/Plugin/FapiValidationValidator/NumericValidator.php

RangeValidator.php in src/Plugin/FapiValidationValidator/RangeValidator.php

RegexpValidator.php in src/Plugin/FapiValidationValidator/RegexpValidator.php

UrlValidator.php in src/Plugin/FapiValidationValidator/UrlValidator.php