REG_UNSET        4080 regex.cpp                        if (REG_UNSET (regstart[mcnt]) || REG_UNSET (regend[mcnt]))
REG_UNSET        4225 regex.cpp                                   ? REG_UNSET (regstart[*p]) ? d : regstart[*p]
REG_UNSET        4266 regex.cpp                                 ? REG_UNSET (regend[*p]) ? d : regend[*p]
REG_UNSET        4400 regex.cpp                  if (REG_UNSET (regstart[regno]) || REG_UNSET (regend[regno]))