Hibernate validator: @Email accepts ask@stackoverflow as valid?

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You can also use constraint composition as a work-around. In the example below, I rely on the @Email validator to do the main validation, and add a @Pattern validator to make sure the address is in the form of [email protected] (I don’t recommend using just the @Pattern below for regular Email validation) 

@Email(message="Please provide a valid email address")
@Pattern(regexp=".+@.+\\..+", message="Please provide a valid email address")
@Target( { METHOD, FIELD, ANNOTATION_TYPE })
@Retention(RUNTIME)
@Constraint(validatedBy = {})
@Documented
public @interface ExtendedEmailValidator {
    String message() default "Please provide a valid email address";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};
}

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