diff --git a/java/java-tests/testSrc/com/intellij/find/FindManagerTest.java b/java/java-tests/testSrc/com/intellij/find/FindManagerTest.java
index 7cd154a97381..0419033fdc23 100644
--- a/java/java-tests/testSrc/com/intellij/find/FindManagerTest.java
+++ b/java/java-tests/testSrc/com/intellij/find/FindManagerTest.java
@@ -920,6 +920,13 @@ public class FindManagerTest extends DaemonAnalyzerTestCase {
     runAsyncTest("/*" + text + "*/", findModel);
   }
 
+  public void testProperInsensitiveSearchForRegExp() throws Exception {
+    createFile("a.java", "Цитрус цитрус");
+    FindModel findModel = FindManagerTestUtils.configureFindModel("цитрус");
+    findModel.setRegularExpressions(true);
+    assertSize(2, findUsages(findModel));
+  }
+
   private void runAsyncTest(String text, FindModel findModel) throws InterruptedException {
     final Ref<FindResult> result = new Ref<>();
     final CountDownLatch progressStarted = new CountDownLatch(1);
diff --git a/platform/indexing-api/src/com/intellij/find/FindModel.java b/platform/indexing-api/src/com/intellij/find/FindModel.java
index a073dd244a64..85120a860887 100644
--- a/platform/indexing-api/src/com/intellij/find/FindModel.java
+++ b/platform/indexing-api/src/com/intellij/find/FindModel.java
@@ -937,7 +937,7 @@ public class FindModel extends UserDataHolderBase implements Cloneable {
     Pattern pattern = myPattern;
     if (pattern == PatternUtil.NOTHING) {
       try {
-        myPattern = pattern = Pattern.compile(toFind, isCaseSensitive() ? Pattern.MULTILINE : Pattern.MULTILINE | Pattern.CASE_INSENSITIVE);
+        myPattern = pattern = Pattern.compile(toFind, isCaseSensitive() ? Pattern.MULTILINE : Pattern.MULTILINE | Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE);
       }
       catch (PatternSyntaxException e) {
         myPattern = pattern = null;