HV-2057 Adjust constraint message regex check

Author: marko-bekhta

annotation-processor/src/main/java/org/hibernate/validator/ap/internal/checks/annotationparameters/AnnotationMessageCheck.java

@@ -21,7 +21,7 @@
  */
 public abstract class AnnotationMessageCheck extends AnnotationParametersAbstractCheck {
 
-	private static final String WORDS_SEPARATED_WITH_DOTS = "(\\w)+(\\.(\\w)+)*";
+	private static final String WORDS_SEPARATED_WITH_DOTS = "\\w+(?:\\.\\w+)*+";
 
 	// for dots and no {} around, or one of the {} is missing
 	private static final Pattern MESSAGE_PATTERN = Pattern.compile( WORDS_SEPARATED_WITH_DOTS + "|\\{" + WORDS_SEPARATED_WITH_DOTS + "|" + WORDS_SEPARATED_WITH_DOTS + "\\}" );