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(defun refactor-extract ()
  "Change region into a subroutine"
...

  (shell-command-on-region (point) (mark) "./refactor-extract" t)
  )

#!/usr/bin/perl

...
my $code = join '', <>;
my $name = "refactored_" . sprintf( "%04d", rand() * 10000 );
print join "\n", Devel::Refactor->new->extract_subroutine( $name, $cod
+e );