diff --git a/test/java/util/regex/RegExTest.java b/test/java/util/regex/RegExTest.java
index f0563d9..aba74b0 100644
--- a/test/java/util/regex/RegExTest.java
+++ b/test/java/util/regex/RegExTest.java
@@ -33,7 +33,7 @@
  * 5013885 5003322 4988891 5098443 5110268 6173522 4829857 5027748 6376940
  * 6358731 6178785 6284152 6231989 6497148 6486934 6233084 6504326 6635133
  * 6350801 6676425 6878475 6919132 6931676 6948903 6990617 7014645 7039066
- * 7067045 7014640 7189363 8007395 8013252 8013254 8012646
+ * 7067045 7014640 7189363 8007395 8013252 8013254 8012646 8023647
  */
 
 import java.util.regex.*;
@@ -146,6 +146,7 @@
         linebreakTest();
         branchTest();
         groupCurlyNotFoundSuppTest();
+        groupCurlyBackoffTest();
         patternAsPredicate();
         if (failure) {
             throw new
@@ -3999,6 +4000,15 @@
         report("GroupCurly NotFoundSupp");
     }
 
+    // This test is for 8023647
+    private static void groupCurlyBackoffTest() throws Exception {
+        if (!"abc1c".matches("(\\w)+1\\1") ||
+            "abc11".matches("(\\w)+1\\1")) {
+            failCount++;
+        }
+        report("GroupCurly backoff");
+    }
+
     // This test is for 8012646
     private static void patternAsPredicate() throws Exception {
         Predicate<String> p = Pattern.compile("[a-z]+").asPredicate();