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  1. or download this
      m!(\d+).+to.+(\d+)!i
  2. or download this
      123to456
  3. or download this
      (12)3to45(6)
   $1       $2
  4. or download this
      m!(\d+)\D+to\D+(\d+)!i;
  5. or download this
      m!(\d+)\D*?to\D*?(\d+)!i;