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Pattern matches only when named

• To: mathgroup at smc.vnet.net
• Subject: [mg43873] Pattern matches only when named
• From: Ken Morgan <kemorgan at vt.edu>
• Date: Thu, 9 Oct 2003 01:55:17 -0400 (EDT)
• Organization: Virginia Tech, Blacksburg, Virginia, USA
• Sender: owner-wri-mathgroup at wolfram.com

Just a curiosity:

In[1]:=   f + g /. u_ + _ -> h
Out[1]:=  h

but

In[2]:=   f + g /. _ + _ -> h
Out[2]:=  f + g

Why does the pattern match only when one of the Blanks has a name?


Thanks,
Ken

• Follow-Ups:
  • Re: Pattern matches only when named
    • From: "Peter Pein" <petsie@arcor.de>