diff --git a/tests/org.eclipse.ui.workbench.texteditor.tests/src/org/eclipse/ui/internal/findandreplace/FindReplaceLogicTest.java b/tests/org.eclipse.ui.workbench.texteditor.tests/src/org/eclipse/ui/internal/findandreplace/FindReplaceLogicTest.java
index 94b1e805d25..463b81d9f6c 100644
--- a/tests/org.eclipse.ui.workbench.texteditor.tests/src/org/eclipse/ui/internal/findandreplace/FindReplaceLogicTest.java
+++ b/tests/org.eclipse.ui.workbench.texteditor.tests/src/org/eclipse/ui/internal/findandreplace/FindReplaceLogicTest.java
@@ -719,6 +719,19 @@ public void testWholeWordSearchAvailable() {
 		assertFalse(isConsideredWholeWord.test(""));
 	}
 
+	@Test
+	public void testWholeWordRemainsAvailableWhenUnavailableRegexIsActivated() {
+		IFindReplaceLogic findReplaceLogic= setupFindReplaceLogicObject(null);
+		findReplaceLogic.setFindString("word");
+		assertFalse(findReplaceLogic.isAvailable(SearchOptions.REGEX)); // null target has no regex support
+		assertTrue(findReplaceLogic.isAvailable(SearchOptions.WHOLE_WORD));
+
+		findReplaceLogic.activate(SearchOptions.REGEX);
+
+		// Activating an unavailable option has no effective impact, so whole-word must remain available
+		assertTrue(findReplaceLogic.isAvailable(SearchOptions.WHOLE_WORD));
+	}
+
 	@Test
 	public void testReplaceInScopeStaysInScope() {
 		TextViewer textViewer= setupTextViewer(LINE_STRING + lineSeparator() + LINE_STRING + lineSeparator() + LINE_STRING);