[R] regexp inside and outside brackets

Jeff Newmiller jdnewmil at dcn.davis.ca.us
Fri Dec 11 16:05:11 CET 2015

The gsub function is your friend. 

s <- "A1{0}~B0{1} CO{a2}NN{12}"
gsub( "([^{}]*)\\{([^{}]*)\\}", "\\1 ", s )
gsub( "([^{}]*)\\{([^{}]*)\\}", "\\2 ", s )

but keep in mind that there are many resources on the Internet for learning about regular expressions... they are hardly R-specific. 

Sent from my phone. Please excuse my brevity.

On December 11, 2015 5:50:28 AM PST, "Adrian Dușa" <dusa.adrian at unibuc.ro> wrote:
>For the regexp aficionados, out there:
>I need a regular expression to extract either everything within some
>brackets, or everything outside the brackets, in a string.
>This would be the test string:
>"A1{0}~B0{1} CO{a2}NN{12}"
>Everything outside the brackets would be:
>"A1 ~B0 CO NN"
>and everything inside the brackets would be:
>"0 1 a2 12"
>I have a working solution involving strsplit(), but I wonder if there
>is a
>more direct way.
>Thanks in advance for any hint,
>Adrian Dusa
>University of Bucharest
>Romanian Social Data Archive
>Soseaua Panduri nr.90
>050663 Bucharest sector 5
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>R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>PLEASE do read the posting guide
>and provide commented, minimal, self-contained, reproducible code.

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