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Pattern Matching Question

• To: mathgroup at smc.vnet.net
• Subject: [mg116702] Pattern Matching Question
• From: Just A Stranger <forpeopleidontknow at gmail.com>
• Date: Thu, 24 Feb 2011 06:23:57 -0500 (EST)

I'm new to pattern matching, and am stuck on a seemingly simple probem:

If I want to transform a pattern like

(I)  Power[x,_]   i.e. x^_

but NOT

(II) Power[x,Plus[_,_]]   i.e. x^(_+_)

How would I go about making that rule?

x^_ -> NewForm

Applies the rule to (II), which I don't want.

Thank you for your help :)