SIGN_EXTEND_CHAR 261 regex.cpp #undef SIGN_EXTEND_CHAR SIGN_EXTEND_CHAR 263 regex.cpp #define SIGN_EXTEND_CHAR(c) ((signed char) (c)) SIGN_EXTEND_CHAR 266 regex.cpp #define SIGN_EXTEND_CHAR(c) ((((unsigned char) (c)) ^ 128) - 128)