> sub("^I\\((.*)\\^.*$", "\\1", MyData)
[1] "Test1" "Test2" "Test1" "Test2"
"Test1.Test2"
In this case, there is a simple way of discovering which variable names
are present, though
> all.vars(parse(text = MyData))
[1] "Test1" "Test2" "Test1.Test2"
Bill Venables
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-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of Tom.O
Sent: Tuesday, 12 February 2008 8:44 PM
To: r-help@r-project.org
Subject: [R] Matching Problem
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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