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  # Get everything between B and D:
  perl -lwe 'print join " ", grep scalar(/B/../D/), qw(A B C D E F)'
  # prints:
  # B C D

  # Get everything between up to D:
  perl -lwe 'print join " ", grep scalar(1../D/), qw(A B C D E F)'
...
  # Use of uninitialized value in range (or flip) at -e line 1.
  # Use of uninitialized value in range (or flip) at -e line 1.
  # Use of uninitialized value in range (or flip) at -e line 1.

  # Get everything up to and D:
  perl -lwe 'print join " ", grep scalar(/./../D/), qw(A B C D E F)'
  # prints:
  # A B C D E F

  # Get everything up to D:
  perl -lwe 'print join " ", map scalar(/./../D/), qw(A B C D E F)'
  # prints:
  # 1 2 3 4E0 1 2