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MathGroup Archive 1999

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Re: ? Repeated Patterns ?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg19016] Re: ? Repeated Patterns ?
  • From: Bruno Daniel <bruno.daniel at hadiko.de>
  • Date: Tue, 3 Aug 1999 13:44:50 -0400
  • Organization: University of Karlsruhe
  • References: <7n8nfc$k9m@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi DongGook 

Beware that ".." doesn't match the same expression, but the same
pattern, for example:

In[1]:={0,1,2,3} /. {x_Integer..}->{x}
Out[1]= {0,1,2,3}

Another problem in your approach is that all patterns except for the
last try to find the shortest match:

If you want to collaps general repetitions of arguments you can do
it this way (the pattern is applied repeatedly):

In[2]:={0,3,5,0,0,1,3,3,4} //.{a___,x_Integer,b___,x_,c___}->{a,x,b,c}
Out[2]={0,3,5,1,4}

If you rather want to collapse subsequent repetitions:

In[3]:={0,3,5,0,0,1,3,3,4} //.{a___,x_Integer,x_,c___}->{a,x,c}
Out[3]={0,3,5,0,1,3,4}

Yours sincerely
  Bruno


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