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(emacs-lisp-intro.info)re-search Exercises

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Exercises with `re-search-forward'
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   * Write a function to search for a regular expression that matches
     two or more blank lines in sequence.

   * Write a function to search for duplicated words, such as `the the'.
     Note: Syntax of Regular Expressions, for
     information on how to write a regexp (a regular expression) to
     match a string that is composed of two identical halves.  You can
     devise several regexps; some are better than others.  The function
     I use is described in an appendix, along with several regexps.
     Note: `the-the' Duplicated Words Function.