[R] string manipulation

[Janko Thyson]

You might want to take a look at 'regexpr' and/or 'gregexpr':

mytext <- "I want the number 2000, not the number two thousand"
idx <- regexpr("\\d{4}", mytext)
idx <- c(idx, (idx + attributes(idx)$match.length)-1)
substr(start=idx[1], stop=idx[2], mytext)

HTH,
Janko

On 26.08.2011 03:51, Lorenzo Cattarino wrote:
> Apologies for confusion. What I meant was the following:
>
> mytext<- "I want the number 2000, not the number two thousand"
>
> and the problem is to select "2000" as the first four digits after the word "number". The position of 2000 in the string might change.
>
> thanks
> Lorenzo
>
> -----Original Message-----
> From: Steven Kennedy [mailto:stevenkennedy2263 at gmail.com]
> Sent: Friday, 26 August 2011 11:31 AM
> To: Henrique Dallazuanna
> Cc: Lorenzo Cattarino; r-help at r-project.org
> Subject: Re: [R] string manipulation
>
> You can split your string, and then only take the first 4 digits after
> that (this is only an improvement if your numbers might not be at the
> end of mytext):
>
> mytext<- "I do not want the first number 1234, but the second number 5678"
> sstr<-strsplit(mytext,split="second number ")[[1]][2]
> nynumbers<-substr(sstr,1,4)
>
>
> On Fri, Aug 26, 2011 at 11:18 AM, Henrique Dallazuanna<wwwhsd at gmail.com>  wrote:
>> Try this:
>>
>> gsub(".*second number ", "", mytext)
>>
>> On Thu, Aug 25, 2011 at 8:00 PM, Lorenzo Cattarino
>> <l.cattarino at uq.edu.au>  wrote:
>>> I R-users,
>>>
>>> I am trying to find the way to manipulate a character string to select a 4 digit number after some specific word/s. Example:
>>>
>>> mytext<- "I do not want the first number 1234, but the second number 5678"
>>>
>>> Is there any function that allows you to select a certain number of digits (in this case 5678) after a particular word/s (e.g., second number)
>>>
>>> Thank you for your help
>>>
>>> Lorenzo
>>>
>>>
>>>         [[alternative HTML version deleted]]
>>>
>>> ______________________________________________
>>> R-help at r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>>> and provide commented, minimal, self-contained, reproducible code.
>>>
>>
>>
>> --
>> Henrique Dallazuanna
>> Curitiba-Paraná-Brasil
>> 25° 25' 40" S 49° 16' 22" O
>>
>> ______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>