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Group and Replace itens sequence in a list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg127793] Group and Replace itens sequence in a list
  • From: Murta <rodrigomurtax at gmail.com>
  • Date: Thu, 23 Aug 2012 02:52:02 -0400 (EDT)
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Hi All

   I have a simple problem that is:

l={1,2,3,a,b,a,4,5,6,a,b,c,7,8,9,a,b,a,10,11,12}

I want to replace all a,b,a sequence by X to get:

l={1,2,3,X,4,5,6,a,b,7,8,9,X,10,11,12}

Then I want to group it by X intervals as
l={{1,2,3},{4,5,6,a,b,7,8,9},{10,11,12}}

If I don't need to put the intermediate X, even better!
I think the with pattern, RaplaceAll and DeleteCases I can do It. Some clue?
Tks
Murta





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