From: Martin Pirker <crf@...>
Date: 2005-12-14T22:22:40+09:00
Subject: Re: string mangling

Robert Klemme <bob.news@gmx.net> 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
>> 
>> case section
>>   /aaaa/ ...
>> 
>>   /bbb/  ...
>> 
>>   /cccc/ ..
>> 
>>   else
>> 
>> end
[...]
> Or, if you want to avoid a second match:

of course I want :-)
 
>>> s.scan /(a+)|(b+)|(c+)/ do |m|
> ?>   case ( m.inject(0) {|i,e| break i if e; i + 1} )
>>>     when 0
>>>       puts "A"
>>>     when 1
>>>       puts "B"
>>>     when 2
>>>       puts "C"
>>>   end
>>> end
> A
> B
> C
> B
> A
> B
> A
> C
> => "aaaaabbccccceeebbbbbbbbbbeaaabaacccceeee"

....but this doesn't allow a processing step in the "else" case?

Martin