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rules and lists

• To: mathgroup at smc.vnet.net
• Subject: [mg54226] rules and lists
• From: Erich Neuwirth <erich.neuwirth at univie.ac.at>
• Date: Sun, 13 Feb 2005 22:17:15 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

I would like to replace sublists of a list to be replaced by another 
list, such that for example the rule
{1,2}->{1,2,3}
wout tranform
{1,2,3,3,1,2} into
{1,2,3,3,3,1,2,3}
Simply gibbin the transformation rule in the form
{x___,1,2,y___}->{x,1,2,3,y}
does not work.
What is the idiom to do what I want?