rollback aspect urn regex

Author: Yauhenikapl

core/esmf-aspect-model-urn/src/main/java/org/eclipse/esmf/aspectmodel/urn/AspectModelUrn.java

@@ -34,7 +34,7 @@
  * @see <a href="https://eclipse-esmf.github.io/samm-specification/2.0.0/namespaces.html">Definition of the URN</a>
  */
 public class AspectModelUrn implements Comparable<AspectModelUrn> {
-   public static final String NAMESPACE_REGEX = "([a-zA-Z0-9()+,\\-.:=@;$_!*']|%[0-9a-fA-F]{2})+";
+   public static final String NAMESPACE_REGEX = "[a-zA-Z][a-zA-Z0-9]{1,62}\\.[a-zA-Z0-9-]{1,63}(\\.[a-zA-Z0-9_-]{1,63})*";
 
    public static final String NAMESPACE_REGEX_PART = "[a-zA-Z][a-zA-Z0-9]{1,62}(\\.[a-zA-Z0-9_-]{1,63})*";
    public static final Pattern NAMESPACE_PATTERN = Pattern.compile( NAMESPACE_REGEX );