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  1. or download this
    /
  (
    (?<=prefix)
...
  )
  (??{ print $^N })
/gx
  2. or download this
    /
  prefix
  (infix)
  suffix
  (??{ print $^N })
/gx
  3. or download this
    /
  (
    (?<=some(optional)?prefix)
...
  )
  (??{ print $^N })
/gx
  4. or download this
    /
  some(optional)?prefix
  (infix)
  suffix
  (??{ print $^N })
/gx