Index: src/functions/org/apache/jmeter/functions/ChangeCase.java
===================================================================
--- src/functions/org/apache/jmeter/functions/ChangeCase.java	(revision 1816027)
+++ src/functions/org/apache/jmeter/functions/ChangeCase.java	(working copy)
@@ -50,7 +50,7 @@
 public class ChangeCase extends AbstractFunction {
 
     private static final Pattern NOT_ALPHANUMERIC_REGEX = 
-            Pattern.compile("[^a-zA-Z]");
+            Pattern.compile("[\\s\\-_]+");
     private static final Logger LOGGER = LoggerFactory.getLogger(ChangeCase.class);
     private static final List<String> DESC = new LinkedList<>();
     private static final String KEY = "__changeCase";
Index: test/src/org/apache/jmeter/functions/TestChangeCase.java
===================================================================
--- test/src/org/apache/jmeter/functions/TestChangeCase.java	(revision 1816027)
+++ test/src/org/apache/jmeter/functions/TestChangeCase.java	(working copy)
@@ -144,20 +144,29 @@
     
     @Test
     public void testEmptyMode() throws Exception {
-        params.add(new CompoundVariable("ab-CD eF"));
+        params.add(new CompoundVariable("ab_ -CD eF"));
         params.add(new CompoundVariable(""));
         changeCase.setParameters(params);
         String returnValue = changeCase.execute(result, null);
-        assertEquals("AB-CD EF", returnValue);
+        assertEquals("AB_ -CD EF", returnValue);
     }
-
+    
     @Test
     public void testChangeCaseWrongModeIgnore() throws Exception {
     	params.add(new CompoundVariable("ab-CD eF"));
-        params.add(new CompoundVariable("Wrong"));
+    	params.add(new CompoundVariable("Wrong"));
+    	changeCase.setParameters(params);
+    	String returnValue = changeCase.execute(result, null);
+    	assertEquals("ab-CD eF", returnValue);
+    }
+
+    @Test
+    public void testChangeCaseNonEnglish() throws Exception {
+    	params.add(new CompoundVariable("ab-àÀè_È é É ù Ù ì Ì ò Ò ñ ÑäöüßCD   eF"));
+        params.add(new CompoundVariable("LOWER_CAMEL_CASE"));
         changeCase.setParameters(params);
         String returnValue = changeCase.execute(result, null);
-        assertEquals("ab-CD eF", returnValue);
+        assertEquals("abÀàèÈÉÉÙÙÌÌÒÒÑÑäöüßcdEf", returnValue);
     }
 
 }