$ perl -MDevel::Peek -e'(my $x = "ababa") =~ m/a/g; print Dump($x);'
SV = PVMG(0x7b65a0) at 0x786680
  REFCNT = 1
  FLAGS = (PADMY,SMG,POK,pPOK)
  IV = 0
  NV = 0
  PV = 0x778780 "ababa"\0
  CUR = 5
  LEN = 8
  MAGIC = 0x780ee0
    MG_VIRTUAL = &PL_vtbl_mglob
    MG_TYPE = PERL_MAGIC_regex_global(g)
    MG_LEN = 1

##</code><code>##

  my $x = "ababa";
  sub foo { \$x; }
  print join " ", @-, @+ while ${foo()} =~ m/a/g;