[R] regexp inside and outside brackets

[Marc Schwartz]

Hi,

Needless to say, Jeff's solution is easier than my second one. I was wrestling in dealing with the greedy nature of regex's and so shifted to thinking about the use of the functions that I proposed in the second scenario.

Also, I was a bit hypo-caffeinated ... ;-)

Regards,

Marc


> On Dec 11, 2015, at 9:12 AM, Adrian Dușa <dusa.adrian at unibuc.ro> wrote:
> 
> Thanks very much, Marc and Jeff.
> Jeff's solutions seem to be simple one liners. I really need to learn these
> things, too powerful to ignore.
> 
> Thank you very much,
> Adrian
> 
> On Fri, Dec 11, 2015 at 5:05 PM, Jeff Newmiller <jdnewmil at dcn.davis.ca.us>
> wrote:
> 
>> 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
>>> 
>>> 
> 
> 
> -- 
> Adrian Dusa
> University of Bucharest
> Romanian Social Data Archive
> Soseaua Panduri nr.90
> 050663 Bucharest sector 5
> Romania
> 
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> 
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