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(emacs-lisp-intro.info)Counting Words

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Counting: Repetition and Regexps
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   Repetition and regular expression searches are powerful tools that
you often use when you write code in Emacs Lisp.  This chapter
illustrates the use of regular expression searches through the
construction of word count commands using `while' loops and recursion.

Why Count Words

count-words-region

Use a regexp, but find a problem.

recursive-count-words

Start with case of no words in region.

Counting Exercise