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Re: Using Cases or Position to Find Strings in a List of Strings

  • To: mathgroup at smc.vnet.net
  • Subject: [mg119525] Re: Using Cases or Position to Find Strings in a List of Strings
  • From: Gregory Lypny <gregory.lypny at videotron.ca>
  • Date: Wed, 8 Jun 2011 07:12:26 -0400 (EDT)

Hi Patrick,

Yes, I suppose I could map StringCases across the list of strings and then collect all of the results that are not null, but I was hoping it could be done directly with Cases.

Thanks,

Gregory




On Tue, Jun 7, 2011, at 6:51 AM, Patrick Scheibe wrote:

> Hi,
> 
> what about using StringCases and StringPosition?
> 
> Cheers
> Patrick
> 
> On Tue, 2011-06-07 at 06:48 -0400, Gregory Lypny wrote:
>> Hello everyone,
>> 
>> I have a list of strings called myListOfFilePaths and I want to find 
>> which one of those strings ends in ".DS_Store" (a hidden file created by 
>> the Mac OS).  I can pick it off using Select as
>> 
>> 	Select[myListOfFilePaths, StringMatchQ[#, ___ ~~ ".DS_Store" ~~ 
>> EndOfString] &]
>> 
>> but I can't do it using Cases or Position
>> 
>> 	Cases[myListOfFilePaths, ___ ~~ ".DS_Store" ~~ EndOfString]
>> 
>> 	Position[myListOfFilePaths, ___ ~~ ".DS_Store" ~~ EndOfString]
>> 
>> despite the fact that Head[___ ~~ ".DS_Store" ~~ EndOfString] is StringExpression.  What am I doing wrong?
>> 
>> 	Regards,
>> 
>> 	Gregory
>> 
> 
> 



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