[R] Matching Problem

[jim holtman]

Here is one way of doing it:

> MyData <- c("Test1","Test2","I(Test1^2)","I(Test2^3)","I(Test1.Test2^2)")
> x <- gsub("^(.*\\(|)([^^)]*|.*).*", "\\2", MyData)
> x
[1] "Test1"       "Test2"       "Test1"       "Test2"       "Test1.Test2"
> unique(x)
[1] "Test1"       "Test2"       "Test1.Test2"
>


On Feb 12, 2008 5:44 AM, Tom.O <tom.olsson at dnbnor.com> wrote:
>
> Hi
>
> I have this vector of strings.
>
> MyData <- c("Test1","Test2","I(Test1^2)","I(Test2^3)","I(Test1.Test2^2)")
> where I want to extract only the text after "I(" and before "^" so that the
> string returned only contain c("Test1","Test2","Test1.Test2")
>
> I am not very skilled in the use of matching patterns so bare with me but I
> belive I should use gsub('^.\\(', "",MyData) for removing the "I(" and
> gsub("\\^.+", '',MyData) for the end. but theres got to be a more elegant
> way that does the trick in one go.
>
> So I would appriciate I anyone could give me some advice.
>
> Thanks Tom
> --
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?