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Re: Problem with matching


Josef Karthauser wrote:
> Can someone tell me why this doesn't match?
> 
> F[{x, 2, c}]F[{x, 1, f}] /. F[{___, a_, ___}]F[{___, a_, ___}] :> yes
> 
> I'm expecting 'yes' to be returned if any of the list arguments to F[]
> contain the same value.  It doesn't match however; what am I doing
> wrong?
> 
> Thanks,
> Joe
> --
> Josef Karthauser (joe at tao.org.uk)	       http://www.josef-k.net/
> FreeBSD (cvs meister, admin and hacker)     http://www.uk.FreeBSD.org/
> Physics Particle Theory (student)   http://www.pact.cpes.sussex.ac.uk/
> ================ An eclectic mix of fact and theory. =================
> 
> 
Hi,

This looks like a bug! It works if you make a tiny change:

F[{x,2,c}]F[{x,1,f}]/.F[{___,a_/;True,___}]F[{___,a_,___}]:>yes

David Bailey
dbaileyconsultancy.co.uk


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