    REG_UNSET        4239 libglibc/regex.c                   if (REG_UNSET (regstart[mcnt]) || REG_UNSET (regend[mcnt]))
    REG_UNSET        4384 libglibc/regex.c                              ? REG_UNSET (regstart[*p]) ? d : regstart[*p]
    REG_UNSET        4425 libglibc/regex.c                            ? REG_UNSET (regend[*p]) ? d : regend[*p]
    REG_UNSET        4559 libglibc/regex.c             if (REG_UNSET (regstart[regno]) || REG_UNSET (regend[regno]))