OP_MEMORY_START  1337 regcomp.c            r = add_opcode(reg, OP_MEMORY_START);
OP_MEMORY_START  6207 regcomp.c        { OP_MEMORY_START,        "mem-start",            ARG_MEMNUM  },
OP_MEMORY_START  2473 regexec.c          CASE(OP_MEMORY_START)  MOP_IN(OP_MEMORY_START);