---
 src/java.base/share/classes/java/lang/String.java | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/java.base/share/classes/java/lang/String.java b/src/java.base/share/classes/java/lang/String.java
index 5c234d4dfac..c2dc91d0d37 100644
--- a/src/java.base/share/classes/java/lang/String.java
+++ b/src/java.base/share/classes/java/lang/String.java
@@ -2156,6 +2156,10 @@ public boolean regionMatches(int toffset, String other, int ooffset, int len) {
              (ooffset > (long)other.length() - len)) {
             return false;
         }
+        // Any strings match if length < 0
+        if (len < 0) {
+           return true;
+        }
         byte[] tv = value;
         byte[] ov = other.value;
         byte coder = coder();