Re: Finding the Position of Elements in a List that Contain
- To: mathgroup at smc.vnet.net
- Subject: [mg102189] Re: [mg102157] Finding the Position of Elements in a List that Contain
- From: Jaebum Jung <jaebum at wolfram.com>
- Date: Sat, 1 Aug 2009 03:57:18 -0400 (EDT)
- References: <200907310953.FAA19267@smc.vnet.net>
You can use WordBoundary to search a word.
In[417]:=
StringCases[listOfStrings,__~~WordBoundary~~searchString~~WordBoundary~~___]
Out[417]= {{The cat is here.},{},{},{Where is the cat?}}
For Position, try the following:
Position[listOfStrings,
x_ /; ! StringFreeQ[
x, __ ~~ WordBoundary ~~ searchString ~~ WordBoundary ~~ ___],
Heads -> False]
- Jaebum
Gregory Lypny wrote:
> Hello everyone,
>
> Suppose I have a list of strings, say, sentences such as
>
> listOfStrings = {"The cat is here.", "It's not here.", "Not in the
> catalogue,", "Where is the cat?"}
>
> and a string I want to search for
>
> searchString = "cat"
>
> I can use StringCases to pick off the elements that contain the search
> string
>
> StringCases[listOfStrings, __ ~~ searchString ~~ ___]
>
> {{"The cat is here."}, {}, {"Not in the catalogue,"}, {"Where is the
> cat?"}}
>
> But what if I just want to know the positions of the elements that are
> hits? In this case, it's
>
> {1, 3, 4}
>
> If I use
>
> Position[listOfStrings, ___ ~~ theString ~~ ___]
>
> I get
>
> {}
>
> which is not what I expect. Also how can I have my searchString
> treated like it is a word so that 3 is not one of the hits?
>
> Any hints would be much appreciated.
>
> Gregory
>
>