An annotation class for validating mac addresses with Hibernate Validator.

Macaddr.java

package hibernatevalidator.constraints;

import javax.validation.Constraint;
import javax.validation.Payload;
import javax.validation.ReportAsSingleViolation;
import javax.validation.constraints.Pattern;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.*;

@Pattern(regexp = "^([0-9a-fA-F]{2})(:[0-9a-fA-F]{2}){5}$")
@Target({METHOD, FIELD, ANNOTATION_TYPE})
@Retention(RUNTIME)
@Constraint(validatedBy = {})
@Documented
@ReportAsSingleViolation
public @interface Macaddr {
  String message() default "must be macaddr";

  Class<?>[] groups() default {};

  Class<? extends Payload>[] payload() default {};
}

Great work, thanks for this.
It would be great if couple of lines are added about the usage. That will be even more helpful.