Message-ID: <Pine.LNX.4.64.1012041842370.25614@tajo.ucsd.edu>
Date: 2010-12-05T02:50:19Z
From: Charles C. Berry
Subject: grep for strings
In-Reply-To: <AANLkTinYPp2OfGuKUHxsxV_PJv+urnKZjbm9edBTf6CE@mail.gmail.com>
On Sun, 5 Dec 2010, Santosh Srinivas wrote:
> I am trying to find the function where I can search for a pattern in a
> text string (I thought I could use grep for this but no :().
Correct, but reading
?grep
and running
example( grep )
should show you how to do that search.
>
>> x
> [1] "abcdefghijkl"
>
> I want to find the positions (i.e. equivalent of nchar) for "cd" and
> in case there are multiple hits .. then the results as a array
You will need to deal with the possibility that there are more 'cd's in
some elements of 'text' than in others.
So, it is not obvious that an _array_ will work without some special
tooling.
HTH,
Chuck
>
> Thank you.
>
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>
Charles C. Berry Dept of Family/Preventive Medicine
cberry at tajo.ucsd.edu UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901