[R] grep for strings
Charles C. Berry
cberry at tajo.ucsd.edu
Sun Dec 5 03:50:19 CET 2010
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
example( grep )
should show you how to do that search.
>  "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
> Thank you.
> R-help at r-project.org mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
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
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