[R] Matching Problem

[Bill.Venables at csiro.au]

> 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: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Tom.O
Sent: Tuesday, 12 February 2008 8:44 PM
To: r-help at 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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