diff --git a/sdmx30-infomodel/src/main/java/com/epam/jsdmx/infomodel/sdmx30/SdmxUrn.java b/sdmx30-infomodel/src/main/java/com/epam/jsdmx/infomodel/sdmx30/SdmxUrn.java
index 9da143a..40a4c65 100644
--- a/sdmx30-infomodel/src/main/java/com/epam/jsdmx/infomodel/sdmx30/SdmxUrn.java
+++ b/sdmx30-infomodel/src/main/java/com/epam/jsdmx/infomodel/sdmx30/SdmxUrn.java
@@ -20,10 +20,10 @@ public class SdmxUrn {
     private static final Pattern FULL_URN_PATTERN = Pattern.compile(
         "^"
             + URN_SDMX
-            + "(?<class>\\w+(\\.\\w+)*)="
+            + "(?<class>[\\w.]+)="
             + "(?<agency>[\\w.-]+):(?<id>[\\w@$-]+)"
-            + "\\((?<version>(\\d+\\.\\d+)|(\\d+\\.\\d+\\.\\d+(-[\\w-]+)?)|(\\d+\\+\\.\\d+\\.\\d+)|(\\d+\\.\\d+\\+\\.\\d+)|(\\d+\\.\\d+\\.\\d+\\+))\\)"
-            + "(\\.(?<itemId>([\\w@$-]+)+(\\.[\\w@$-]+)*))?$"
+            + "\\((?<version>(\\d+\\+?)(\\.\\d+\\+?){1,2}(-[\\w-]+)?)\\)"
+            + "(\\.(?<itemId>[\\w@$-]+(\\.[\\w@$-]+)*))?$"
     );
 
     private static final Pattern SHORT_URN_PATTERN = Pattern.compile(
diff --git a/sdmx30-infomodel/src/test/java/com/epam/jsdmx/infomodel/sdmx30/SdmxUrnTest.java b/sdmx30-infomodel/src/test/java/com/epam/jsdmx/infomodel/sdmx30/SdmxUrnTest.java
index 147970c..60dcd78 100644
--- a/sdmx30-infomodel/src/test/java/com/epam/jsdmx/infomodel/sdmx30/SdmxUrnTest.java
+++ b/sdmx30-infomodel/src/test/java/com/epam/jsdmx/infomodel/sdmx30/SdmxUrnTest.java
@@ -139,6 +139,13 @@ void testGetUrnComponents(String urn, UrnComponents expected) {
         assertThat(SdmxUrn.getUrnComponents(urn)).isEqualTo(expected);
     }
 
+    @Test
+    void testGetUrnComponents_notValidUrn() {
+        var t = assertThrows(IllegalArgumentException.class, () -> SdmxUrn.getUrnComponents("urn:sdmx:org.sdmx.infomodel.conceptscheme.Concept=IMF_RES:CS_CSD_CPA(3.0+.0).CPA_RA_330_OTHER_RISKS_(PLEASE_SPECIFY)"));
+
+        assertThat(t).hasMessage("Invalid urn: urn:sdmx:org.sdmx.infomodel.conceptscheme.Concept=IMF_RES:CS_CSD_CPA(3.0+.0).CPA_RA_330_OTHER_RISKS_(PLEASE_SPECIFY)");
+    }
+
     private static Stream<Arguments> testGetUrnComponents() {
         return Stream.of(
             Arguments.of("urn:sdmx:org.sdmx.infomodel.datastructure.DataStructure=ECB:ECB_EXR12(1.0)", UrnComponents.builder()