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Re: replacement x->y except in Exp[x]

• To: mathgroup at smc.vnet.net
• Subject: [mg110849] Re: replacement x->y except in Exp[x]
• From: Bob Hanlon <hanlonr at cox.net>
• Date: Thu, 8 Jul 2010 06:51:08 -0400 (EDT)
• Reply-to: hanlonr at cox.net

expr = a*x + b*x^2 - c*Exp[x];

expr /. {Exp[x] -> z, x -> y} /. z -> Exp[x]

a*y + b*y^2 - c*E^x


Bob Hanlon

---- Sebastian <sebhofer at gmail.com> wrote: 

=============
Is it possible to exclude certain patterns from replacements?
For example I want to replace y for x everywhere except in Exp[x].

TIA Sebastian