From: Hugh Sasse <hgs@...>
Date: 2010-03-04T21:34:30+09:00
Subject: [ruby-core:28470] Re: [Bug #2647] Lack of testing for String#split

On Thu, 4 Mar 2010, Dawid Grzesiak wrote:

> Issue #2647 has been updated by Dawid Grzesiak.
> 
> 
> Or in this example:
> 
> irb(main):053:0> "..l..".split "."
> => ["", "", "l"]
> 
> there is no symmetry :/


hgs@Q2P14HGS ~
12:27:13$ ruby -e 'puts "..l..".split(/\./).inspect'
["", "", "l"]
                        # Confirmed for regexps
hgs@Q2P14HGS ~
12:27:36$ ruby -e 'puts "..l..".split(/\./,-1).inspect'
["", "", "l", "", ""]
                        # Limit parameter solves this
hgs@Q2P14HGS ~
12:27:46$

ri String#split gives:

----------------------------------------------------------- String#split
     str.split(pattern=$;, [limit])   => anArray

     From Ruby 1.8
-----------------------------------------------------------------
-------
        [...]
     If the _limit_ parameter is omitted, trailing null fields are
     suppressed. If _limit_ is a positive number, at most that number of
     fields will be returned (if _limit_ is +1+, the entire string is
     returned as the only entry in an array). If negative, there is no
     limit to the number of fields returned, and trailing null fields
     are not suppressed.


        HTH
        Hugh