> On Dec 19, 2016, at 1:25 PM, Omar André Gonzáles Díaz
> <oma.gonza...@gmail.com> wrote:
>
> I have the following strings:
>
> [1] "PPA 06 - Promo Vasito" [2] "PPA 05 - Cuentos"
> [3] "PPA 04 - Promo vasito" [4] "PPA 03 - Promoción escolar"
> [5] "PPA - Saluda a tu pediatra" [6] "PPL - Dia del Pediatra"
>
> *Desired result*:
>
> [1] "Promo Vasito" "Cuentos" "Promo vasito"
>
> [4] "Promoción escolar" "Saluda a tu pediatra" "Dia del Pediatra"
All this assumes you are passing a character vector to sub. The combination of
your subject line and the example are a bit underspecified. Here's two solution
one of which is delivering everything beginning with the last cap after the
(last) dash and the other is delivering everything after but not including the
last <dash><spc> sequence:
> sub("^.+[-].+(?=[A-Z])", "" , dat, perl=TRUE) # need perl=TRUE for PCRE
> look-ahead
[1] "Vasito" "Cuentos"
[3] "Promo vasito" "Promoción escolar"
[5] "Saluda a tu pediatra" "Pediatra"
Greedy matching above, ungreedy; set by '(?U)' below:
> sub("(?U)^.+[-].+(?=[A-Z])", "" , dat, perl=TRUE)
[1] "Promo Vasito" "Cuentos"
[3] "Promo vasito" "Promoción escolar"
[5] "Saluda a tu pediatra" "Dia del Pediatra"
> sub("^.+[-][ ]", "" , dat) # character classes to define sequence.
[1] "Promo Vasito" "Cuentos"
[3] "Promo vasito" "Promoción escolar"
[5] "Saluda a tu pediatra" "Dia del Pediatra"
>
>
> *First attemp*:
>
> After this line:
>
> mead_nov$`Nombre del anuncio` <- gsub("(PPA.*)([A-Z].*)", "\\2",
> mead_nov$`Nombre del anuncio`)
>
> I get these:
>
> [1] "Vasito" [2] "Cuentos" [3] "Promo
> vasito"
> [4] "Promoción escolar" [5] "Saluda a tu pediatra" [6] "PPL - Dia
> del Pediatra"
>
>
> *Second attemp:*
>
> mead_nov$`Nombre del anuncio` <- gsub("(PPA|PPL.*)([A-Z].*)", "\\2",
> mead_nov$`Nombre del anuncio`)
>
> I get this:
>
> [1] "PPA 06 - Promo Vasito" [2] "PPA 05 - Cuentos"
> [3] "PPA 04 - Promo vasito" [3] "PPA 03 - Promoción escolar"
> [5] "PPA - Saluda a tu pediatra" [6] "Pediatra"
>
>
> Thank you for your help.
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
David Winsemius
Alameda, CA, USA
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