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Re: Splitting string by patterns

• To: mathgroup at smc.vnet.net
• Subject: [mg109701] Re: Splitting string by patterns
• From: Albert Retey <awnl at gmx-topmail.de>
• Date: Wed, 12 May 2010 07:35:13 -0400 (EDT)
• References: <hsbbdt$jjp$1@smc.vnet.net>

Hi,

> ...
> There are many possible texts that identify Rows and Columns...I already
> wrote a function with StringPosition
> that tells me where the Rows and Columns begin...for example:
> 
> position = {2,4,5,7,8,15,26,204}
> 
> How can I use these positions to split the long string like I want to?
> 

I think that what you want is StringTake. It will accept a list of
begin-end position pairs which you can e.g. create from your positions
with Partition as I have done below:

StringTake[longstring, Partition[Flatten[{1, position, -1}], 2, 1]]

> P.D.: I tried to use StringSplit first (without using the positions), but to
> determine the positions I'm not only using patterns, so I didn't know how to
> use that function for that.

I think you should be able to use StringSplit, I wonder what you can
achieve with StringPosition that you cannot with StringSplit. Note that
StringSplit accepts arbitrary StringPatterns or RegularExpressions as a
second argument...

hth,

albert