Hi, > 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. > > Example: > > 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) [[1]] [1] 4 48 attr(,"match.length") [1] 3 3 > How can I get the string length (=number of letters stored in Text)? Maybe the nchar funtion ? R> nchar(Text) [1] 55 HTH, -- Julien ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.