diff --git a/src/windows/classes/sun/nio/fs/WindowsFileSystem.java b/src/windows/classes/sun/nio/fs/WindowsFileSystem.java
index 54712098b672f852f4903548f15df79fde5914a6..2ad40cb779889bc1a384ca86b936307d77d3812e 100644
--- a/src/windows/classes/sun/nio/fs/WindowsFileSystem.java
+++ b/src/windows/classes/sun/nio/fs/WindowsFileSystem.java
@@ -283,25 +283,15 @@ class WindowsFileSystem
             }
         }
 
-        // match in uppercase
-        StringBuilder sb = new StringBuilder(expr.length());
-        for (int i=0; i<expr.length(); i++) {
-            sb.append(Character.toUpperCase(expr.charAt(i)));
-        }
-        expr = sb.toString();
+        // match in unicode_case_insensitive
+        final Pattern pattern = Pattern.compile(expr,
+            Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE);
 
         // return matcher
-        final Pattern pattern = Pattern.compile(expr);
         return new PathMatcher() {
             @Override
             public boolean matches(Path path) {
-                // match in uppercase
-                String s = path.toString();
-                StringBuilder sb = new StringBuilder(s.length());
-                for (int i=0; i<s.length(); i++) {
-                    sb.append( Character.toUpperCase(s.charAt(i)) );
-                }
-                return pattern.matcher(sb).matches();
+                return pattern.matcher(path.toString()).matches();
             }
         };
     }
diff --git a/test/java/nio/file/PathMatcher/Basic.java b/test/java/nio/file/PathMatcher/Basic.java
index 16efcf099d08e41f7257cf79151ae5c154a72167..3050eb30ae7b6fdaa33c6074f93261f7fb4cefe7 100644
--- a/test/java/nio/file/PathMatcher/Basic.java
+++ b/test/java/nio/file/PathMatcher/Basic.java
@@ -22,7 +22,7 @@
  */
 
 /* @test
- * @bug 4313887
+ * @bug 4313887 6866397
  * @summary Unit test for java.nio.file.PathMatcher
  */
 
@@ -68,6 +68,20 @@ public class Basic {
         }
     }
 
+    static void assertRegExMatch(String path, String pattern) {
+        System.out.format("Test regex pattern: %s", pattern);
+        Path file = Paths.get(path);
+        boolean matched =  file.getFileSystem()
+                               .getPathMatcher("regex:" + pattern).matches(file);
+        if (matched) {
+            System.out.println(" OKAY");
+        } else {
+            System.out.println(" ==> UNEXPECTED RESULT!");
+            failures++;
+        }
+    }
+
+
     public static void main(String[] args) {
         // basic
         assertMatch("foo.html", "foo.html");
@@ -140,21 +154,13 @@ public class Basic {
             assertMatch("one*two", "one\\*two");
         }
 
-
-
         // regex syntax
-        {
-            String pattern = ".*\\.html";
-            System.out.format("Test regex pattern: %s", pattern);
-            Path file = Paths.get("foo.html");
-            boolean matched =  file.getFileSystem()
-                .getPathMatcher("regex:" + pattern).matches(file);
-            if (matched) {
-                System.out.println(" OKAY");
-            } else {
-                System.out.println(" ==> UNEXPECTED RESULT!");
-                failures++;
-            }
+        assertRegExMatch("foo.html", ".*\\.html");
+
+        if (System.getProperty("os.name").startsWith("Windows")) {
+            assertRegExMatch("foo012", "foo\\d+");
+            assertRegExMatch("fo o", "fo\\so");
+            assertRegExMatch("foo", "\\w+");
         }
 
         // unknown syntax