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bug#20230: 24.4.91; slow regexp

From: Nicolas Richard
Subject: bug#20230: 24.4.91; slow regexp
Date: Mon, 30 Mar 2015 16:46:45 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.91 (gnu/linux)

Consider this snippet:

  (insert "**** foo\n")
  (insert ":PROPERTIES:\n")
  (dotimes (_ 7) (insert ":a:     \n"))
  (insert ":bar: foo\n\n:END:")
  (goto-char 10) ;; beginning of second line
  (looking-at "^[       ]*:PROPERTIES:[         ]*
\\(?:[  ]*:\\S-+:\\(?: .*\\)?[  ]*
\\)*[   ]*:END:[        ]*$"))

If that doesn't take several seconds, increasing the number 7 to 8, 9 or
more probably will. It does for me.

The regexp is one from org mode.

(It was suggested that a file this as a separate bug report in


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