From: Daniel DeLorme <dan-ml@...42.com>
Date: 2007-11-02T00:33:09+09:00
Subject: Re: String#split and groups in the field separator RE

Daniel Sheppard wrote:
>> Is this expected behaviour? I haven't seen anything related to this
>> mentioned in the API docs...
>>
>> irb(main):060:0> s.split(/(:)+/)
>> => ["a", ":", "b", ":", "c", ":", "d"]			
> 
> Yes, any capture groups in the regex will be included in the split
> array. If you want to use groups without capturing it into the split
> array, use a non-capturing group - ie, /(?=,)/ rather than /(,)/

/(?=,)/ is a lookahead match. I'm sure you really meant /(?:,)/