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In message "Re: regular expression gurus--help!"
    on 09/06/21, Sebastian Hungerecker <sepp2k / googlemail.com> wrote:

  >>> "abcdefghijkl".scan(/(.)(?.))/).map(&:join)
  > ["abc", "bcd", "cde", "def", "efg", "fgh", "ghi", "hij", "ijk", "jkl"]

I find this really interesting, but what version of Ruby is this?  I am
not able to reproduce your result.

$ ruby -v
ruby 1.8.7 (2008-08-11 patchlevel 72) [i486-linux]
$ ruby1.9 -e 'p "abcdefghijkl".scan(/(.)((?))/).map(&:join)'
["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"]

$ ruby1.9 -v
ruby 1.9.0 (2008-06-20 revision 17482) [i486-linux]
$ ruby1.9 -e 'p "abcdefghijkl".scan(/(.)((?))/).map(&:join)'
["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"]

Or is this a feature of 1.9.1?

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