matchbracketclass  272 lib/lua/lstrlib.c     case '[': return matchbracketclass(c, p, ep-1);
matchbracketclass  392 lib/lua/lstrlib.c           if (matchbracketclass(uchar(previous), p, ep-1) ||
matchbracketclass  393 lib/lua/lstrlib.c              !matchbracketclass(uchar(*s), p, ep-1)) return NULL;