[R] Replace only Capital Letters

From: Rau, Roland <Rau_at_demogr.mpg.de>
Date: Fri 23 Jul 2004 - 03:17:36 EST


Dear All,

I have these data:

exampledata <- c("This is one item", "This is Another One", "And so is This")

I would like to find each occurence of a blank space followed by a Capital Letter and replace it by a blank space, a left curly brace, the respective Capital Letter, and then a right curly brace.

I thought the following will do:
gsub(pattern = " ([A-Z])", replacement = " {\\1}", x=exampledata, ignore.case=FALSE)

Unfortunately, the actual output was:
"This {i}s {o}ne {i}tem" "This {i}s {A}nother {O}ne" "And {s}o {i}s
{T}his"

But what I wanted was actually:
"This is one item" "This is {A}nother {O}ne" "And so is {T}his"

Can anyone tell me what I should change. Should be fairly easy for people with more experience than me using regular expressions, I guess.

Thanks,
Roland

P.S. The background is my bibliography-file for BibTeX. If the title field has some content like "An analysis of Denmark", it would actually turn out to be "An analysis of denmark" in my dvi-document. Of course, R is not the appropriate tool for this. But apart from the little problem outlined above, I had a function doing what I wanted in less than 10 minutes.

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