eintr: re-search Exercises

 
 12.6 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”.
      SeeSyntax of Regular Expressions (emacs)Regexps, 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.
      See‘the-the’ Duplicated Words Function the-the.