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  1. or download this
    say $-[1], ': ', $1 while 'olololo' =~ /
    (?=
...
    )
    (?#*F)
/x;
  2. or download this
    0: olololo
1: lolol
...
1: lolol
0: olololo
match
  3. or download this
    4: olo
3: lol
...
1: lol
0: ololo
0: olo