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    $re0 = qr/
          (??{ $re1 })*
       /x;
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    $re0 = qr/
          (??{ $re1 }) (??{ $re0 })
          |
          # Nothing
       /x;
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    $re0 = qr/
          (??{ $re1 })+
       /x;
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    $re0  = qr/
           (??{ $re1 }) (??{ $re0_ })
...
           |
           # Nothing
        /x;
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    $re0  = qr/
           (??{ $re1 })?
        /x;
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    $re0  = qr/
           (??{ $re1 })
           |
           # Nothing
        /x;