https://www.playframework.com/documentation/2.7.0/api/java/play/data/validation/Constraints.EmailValidator.html
Constraints.EmailValidator (Play 2.7.0)
constraintsplay
https://emailvalidator.co/
emailvalidator
https://vaadin.com/api/platform/current/com/vaadin/flow/data/validator/EmailValidator.html
EmailValidator (Vaadin Platform (vaadin-platform-javadoc) 25.1.5 API)
declaration: package: com.vaadin.flow.data.validator, class: EmailValidator
vaadinplatformjavadocapi