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Checking for a given phrase in an expression

• To: mathgroup at smc.vnet.net
• Subject: [mg60744] Checking for a given phrase in an expression
• From: lost.and.lonely.physicist at gmail.com
• Date: Tue, 27 Sep 2005 03:45:16 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Hello everyone

Is it possible to ask Mathematica to check if a given phrase occurs in
an expression? Say I have

aa = 1 + x + x y + Log[Sin[z]]

and

bb = x + Log[Sin[z]]

Can Mathematica tell me such a phrase bb exists in aa? Can it tell me
its 'position' within the expression aa?

Thanks for the help!

• Follow-Ups:
  • Re: Checking for a given phrase in an expression
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>
  • Re: Checking for a given phrase in an expression
    • From: <bsyehuda@gmail.com>