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From: Emanuel Berg <moasen@zoho.com>
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Subject: count regexp hits
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Just wrote this [1] - is this somewhere already
or is it so simple so you are expected to do it
yourself? If so - well, don't count on it.
I actually know many people incapable of
writing any of this!

(defun count-regexp-hits (regexp)
  (interactive "sregexp: ")
  (let ((hits 0))
    (save-excursion
      (while (re-search-forward regexp (point-max) t)
        (cl-incf hits) ))
    (message "%d" hits) ))

Example usage - eval me:

%% how many books? (count-regexp-hits "@book")

@book{fiberglass-boat-repair-manual,
  author     = {Allan Vaitses},
  ISBN       = {0-07-156914-6},
  publisher  = {International Marine},
  title      = {The Fiberglass Boat Repair Manual},
  year       = 1988
}

@book{savage-sword-of-conan-22,
  author     = {Roy Thomas},
  ISBN       = 1616558717,
  publisher  = {Dark Horse},
  title      = {Savage Sword of Conan 22},
  year       = 2016
}

[1] http://user.it.uu.se/~embe8573/emacs-init/count.el

-- 
underground experts united
http://user.it.uu.se/~embe8573