SV = PVMG(0x5bb22b8c3b80) at 0x5bb22b9beae8
  REFCNT = 1
  FLAGS = (SMG,POK,IsCOW,pPOK)    <-- IsCOW: String buffer is shared
  IV = 0
  NV = 0
  PV = 0x5bb22b9ea230 "..."
  CUR = 99999
  LEN = 100001
  COW_REFCNT = 1
  MAGIC = 0x5bb22b9c48f0
    MG_VIRTUAL = &PL_vtbl_mglob
    MG_TYPE = PERL_MAGIC_regex_global(g)
    MG_FLAGS = 0x40
      BYTES
    MG_LEN = -1