    low_reg          1420 libglibc/regex.c #define POP_FAILURE_POINT(str, pat, low_reg, high_reg, regstart, regend, reg_info)\
    low_reg          1457 libglibc/regex.c   low_reg = (active_reg_t) POP_FAILURE_INT ();				\
    low_reg          1458 libglibc/regex.c   DEBUG_PRINT2 ("  Popping  low active reg: %ld\n", low_reg);		\
    low_reg          1461 libglibc/regex.c     for (this_reg = high_reg; this_reg >= low_reg; this_reg--)		\