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)