From: James Edward Gray II <james@...>
Date: 2005-12-14T22:38:39+09:00
Subject: Re: string mangling

On Dec 14, 2005, at 6:32 AM, Simon Strandgaard wrote:

> On 12/14/05, Martin Pirker <crf@sbox.tu-graz.ac.at> wrote:
>> Imagine an input string
>> aaaaabbccccceeebbbbbbbbbbeaaabaacccceeee...
>>
>> I have regexp for the parts a,b,c
>> and e can be considered as else.
>>
>> So how can I efficiently search/step through the string from left to
>> right, while calling for each section the fitting handler, kind of
>
> irb(main):001:0> s = 'aaaaabbccccceeebbbbbbbbbbeaaabaacccceee'
> => "aaaaabbccccceeebbbbbbbbbbeaaabaacccceee"
> irb(main):002:0> s.scan(/(a+)|(b+)|(c+)|([^abc]+)/)
> => [["aaaaa", nil, nil, nil], [nil, "bb", nil, nil], [nil, nil,
> "ccccc", nil], [nil, nil, nil, "eee"], [nil, "bbbbbbbbbb", nil, nil],
> [nil, nil, nil, "e"], ["aaa", nil, nil, nil], [nil, "b", nil, nil],
> ["aa", nil, nil, nil], [nil, nil, "cccc", nil], [nil, nil, nil,
> "eee"]]
> irb(main):003:0>

My similar thought:

 >> str = 'aaaaabbccccceeebbbbbbbbbbeaaabaacccceee'
=> "aaaaabbccccceeebbbbbbbbbbeaaabaacccceee"
 >> str.scan(/((\w)\2*)/).map { |chunk| chunk.first }
=> ["aaaaa", "bb", "ccccc", "eee", "bbbbbbbbbb", "e", "aaa", "b",  
"aa", "cccc", "eee"]

James Edward Gray II