Bug when switching to std regex

I could not switch to std regex after defining the two variables as in documents. Then I try to fix it in schema.h.

Author: xiaoPierre

include/rapidjson/schema.h

@@ -25,7 +25,7 @@
 #define RAPIDJSON_SCHEMA_USE_INTERNALREGEX 0
 #endif
 
-#if !RAPIDJSON_SCHEMA_USE_INTERNALREGEX && !defined(RAPIDJSON_SCHEMA_USE_STDREGEX) && (__cplusplus >=201103L || (defined(_MSC_VER) && _MSC_VER >= 1800))
+#if !RAPIDJSON_SCHEMA_USE_INTERNALREGEX && defined(RAPIDJSON_SCHEMA_USE_STDREGEX) && (__cplusplus >=201103L || (defined(_MSC_VER) && _MSC_VER >= 1800))
 #define RAPIDJSON_SCHEMA_USE_STDREGEX 1
 #else
 #define RAPIDJSON_SCHEMA_USE_STDREGEX 0