fix: update keyMatch2 for key2 == * (casbin#344)

Author: PokIsemaine

src/main/java/org/casbin/jcasbin/util/BuiltInFunctions.java

@@ -73,8 +73,11 @@ public static boolean keyMatch(String key1, String key2) {
      */
     public static boolean keyMatch2(String key1, String key2) {
         key2 = key2.replace("/*", "/.*");
-        key2 = "^" + KEY_MATCH2_PATTERN.matcher(key2).replaceAll("[^/]+") + "$";
-        return regexMatch(key1, key2);
+        key2 = KEY_MATCH2_PATTERN.matcher(key2).replaceAll("[^/]+");
+        if(Objects.equals(key2, "*")) {
+            key2 = "(.*)";
+        }
+        return regexMatch(key1, "^" + key2 + "$");
     }
 
     /**

src/test/java/org/casbin/jcasbin/main/BuiltInFunctionsUnitTest.java

@@ -68,6 +68,8 @@ public void testKeyMatch2Func() {
         testKeyMatch2("/alice/all", "/:id", false);
 
         testKeyMatch2("/alice/all", "/:/all", false);
+
+        testKeyMatch2("engines/engine1", "*", true);
     }
 
     @Test