From: 7stud -- <bbxx789_05ss@...>
Date: 2007-11-01T14:20:36+09:00
Subject: Re: String#split and groups in the field separator RE

mortee wrote:
> Is this expected behaviour? I haven't seen anything related to this
> mentioned in the API docs...
> 
> irb(main):057:0> s = 'a::b:::c::::d'
> => "a::b:::c::::d"
> irb(main):058:0> s.split(/:/)
> => ["a", "", "b", "", "", "c", "", "", "", "d"]      => OK
> irb(main):059:0> s.split(/:+/)
> => ["a", "b", "c", "d"]            => OK
> irb(main):060:0> s.split(/(:)+/)
> => ["a", ":", "b", ":", "c", ":", "d"]        => ?
> irb(main):061:0> s.split(/((:)+)/)
> => ["a", "::", ":", "b", ":::", ":", "c", "::::", ":", "d"]  => ???
> irb(main):062:0> s.split(/(:+)/)
> => ["a", "::", "b", ":::", "c", "::::", "d"]      => ???
> 

It was unexpected behavior for me when I ran into it using python's 
regex split() function a few months ago.  Since it works the same way in 
both languages, I would guess it might be a universal regex trait.





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