set_number_at     819 regex.cpp              case set_number_at:
set_number_at    2632 regex.cpp                           insert_op2 (set_number_at, laststart, 5, lower_bound, b);
set_number_at    2661 regex.cpp                               insert_op2 (set_number_at, laststart, b - laststart,
set_number_at    3337 regex.cpp      	case set_number_at:
set_number_at    4880 regex.cpp      	case set_number_at:
set_number_at    5322 regex.cpp          case set_number_at: