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I am doing code study of org-mode. And in most places, org-mode uses regexps defined in org.el. Like, org-todo-line-regexp, org-not-done-regexp,org-deadline-regexp,org-scheduled-regexp and org-mode has lot more regexp variables.

What surprises me is that, most of these regexps are defvar-ed with their start time values as nil.

where to find the regex literals for these variables?

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You should learn to use rgrep. It looks like regexps are set in org-set-regexps-and-options.

  • Could you explain how rgrep pertains to your answer? – user2699 Mar 3 '15 at 21:10
  • @user2699, just point at org-todo-line-regexp and call rgrep. You'll find all references to it in the source. – abo-abo Mar 3 '15 at 21:13

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