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(defun perl-outline-mode ()
  "set customized outline minor mode for Perl"
  (interactive)
  (setq outline-regexp "sub")
  (outline-minor-mode))

(defun perl-outline-mode ()
  "set customized outline minor mode for Perl"
...
  (setq outline-regexp 
    "#!.\\|\\(pac\\)kage\\|sub\\|\\(=he\\)ad\\|\\(=po\\)d")
  (outline-minor-mode))