int regex_cachesize = 0;
const pcre2_code *regex_ismsgid = NULL;
const pcre2_code *regex_smtp_code = NULL;
-const uschar *regex_vars[REGEX_VARS] = { 0 };;
+const uschar *regex_vars[REGEX_VARS] = { NULL };
#ifdef WHITELIST_D_MACROS
const pcre2_code *regex_whitelisted_macro = NULL;
#endif