From: Harry Kakueki <list.push@...>
Date: 2009-06-22T10:29:54+09:00
Subject: Re: regular expression gurus--help!

On Sun, Jun 21, 2009 at 9:26 PM, Sebastian
Hungerecker<sepp2k@googlemail.com> wrote:
> Am Sonntag 21 Juni 2009 09:10:37 schrieb timr:
>> I want all possible three letter sets for a string. Scan does this:
>> irb>
>>
>> >>"abcdefghijkl".scan(...)
>>
>> # >> abc
>> # >> def
>> # >> ghi
>> # >> jkl
>>
>> But I need:
>> # >> abc
>> # >> bcd
>> # >> cde
>> # >> def
>> etc.
>
>>> "abcdefghijkl".scan(/(.)(?=(..))/).map(&:join)
> => ["abc", "bcd", "cde", "def", "efg", "fgh", "ghi", "hij", "ijk", "jkl"]
>
> HTH,
> Sebastian
>
>

I am not the OP, but thanks for that solution.
I learned more about regular expressions and relearned something about scan.

It did not work on my machine so I changed it to this.
p "abcdefghijkl".scan(/(.)(?=(..))/).map{|x| x.join}

Is this     map(&:join)   using 1.9?


Harry

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