    reg_no           5408 libglibc/regex.c   int reg_no;
    reg_no           5430 libglibc/regex.c       reg_no = *p1;
    reg_no           5431 libglibc/regex.c       assert (reg_no > 0 && reg_no <= MAX_REGNUM);
    reg_no           5437 libglibc/regex.c       if (REG_MATCH_NULL_STRING_P (reg_info[reg_no]) == MATCH_NULL_UNSET_VALUE)
    reg_no           5438 libglibc/regex.c         REG_MATCH_NULL_STRING_P (reg_info[reg_no]) = ret;