From: Harry Kakueki <list.push@...>
Date: 2009-06-21T17:08:43+09:00
Subject: Re: regular expression gurus--help!

On Sun, Jun 21, 2009 at 4:10 PM, timr<timrandg@gmail.com> wrote:
> I want all possible three letter sets for a string. Scan does this:
> irb>
>
> But I need:
> # >> abc
> # >> bcd
> # >> cde
> # >> def
> etc.
>
> I used to know the secret spell, but forgot it. Does anyone know how
> to do this with regular expression
>

Here is one way to get that result.
(But not with a regular expression)
Not all 3 letter sets but I think this is the result you are really looking for.


str = "abcdefghijkl"
puts str.unpack("a3X2"*(str.length-2))

#output
abc
bcd
cde
def
efg
fgh
ghi
hij
ijk
jkl


Harry

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