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)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-newout@smc.vnet.net*Delivered-to*: mathgroup-newsend@smc.vnet.net

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

**Follow-Ups**:**Re: Group and Replace itens sequence in a list***From:*Bob Hanlon <hanlonr357@gmail.com>

**Re: Group and Replace itens sequence in a list***From:*Ulrich Arndt <ulrich.arndt@data2knowledge.de>

**Re: Group and Replace itens sequence in a list***From:*Ulrich Arndt <ulrich.arndt@data2knowledge.de>