[R] pattern search
julien at no-log.org
Wed Apr 4 17:49:42 CEST 2007
> I'm looking for an easy possibility for pattern search. I have got a
> string and a special pattern. I would like to know if the pattern
> appears in the string, if yes where does it appear (position) and the
> number of appearance.
> Text = c("If the sun shines, no clouds should be seen in the sky!")
> SearchPattern = c("the")
> NumberOfAppearance = 0
> NumberOfLetters = 0
> --> NumberOfAppearance should be 2 in the end
I think you are looking for the gregexpr function.
R> Text = c("If the sun shines, no clouds should be seen in the sky!")
R> gregexpr("the", Text)
 4 48
 3 3
> How can I get the string length (=number of letters stored in Text)?
Maybe the nchar funtion ?
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