12.6 Exercises with
- 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”.
See Syntax of Regular Expressions in The GNU Emacs
Manual, 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
the-the Duplicated Words Function.