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Re: StringCases matching on portions of sublist?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg106687] Re: StringCases matching on portions of sublist?
  • From: Albert Retey <awnl at gmx-topmail.de>
  • Date: Thu, 21 Jan 2010 04:52:10 -0500 (EST)
  • References: <hj6qfm$8rk$1@smc.vnet.net>

Am 20.01.2010 12:47, schrieb Jason Ledbetter:
> Folk,
> 
> I'm trying to write a function to narrow down some data by timestamp but I'm
> having some trouble getting this to work.
> 
> My data is a list of lists with the first member of each sublist being a
> date stamp. I was hoping to use StringCases to match but I'm apparently
> missing something here.
> 
> Example data is as follows:
> 
> z={{"Thu Nov 19 12:09:23 GMT 2009", 7492, 0,
>   0}, {"Thu Jan 07 13:48:21 GMT 2010", 9225, 3,
>   0}, {"Thu Dec 17 09:30:52 GMT 2009", 8735, 1, 0}}
> 
> 
> I've tried the following:
> 
> 
> StringCases[z, {"*Nov",___}]
> 
> 
> which returns:
> 
> 
> String or list of strings expected at position 1 in StringCases. This makes
> sense to me.. so I tried:
> 
> 
> StringCases[z[[All,1]], ___~~Nov~~___]
> 
> 
> which returns:
> 
> 
> {{"Thu Nov 19 12:09:23 GMT 2009"}, {}, {}}
> 
> 
> How can this be modified to return the full sublist where the first element
> of the sublist matches a string pattern?

maybe:

Pick[z, StringMatchQ[z[[All, 1]], ___ ~~ "Nov" ~~ ___]]

hth,

albert


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