regex - Detect partial string matches in R -


i trying count number of transactions start ak , contain ak within transaction, don't end in ak.

examples:

exclude: example: ak->se (no ak in between)

exclude: ak->gg->se->ll : not include ak within transaction

include: example: ak->se->ak->gg

sample data:

f<- data.frame( id=c("a","a","a","a","c","c","d","d","e"), mode=c("ak->se","se->ak->gg, bishan->k","ak->se","se->gr->gg, bishan->ak","ak->se","se->gr->gg, bishan->ak","ak->se","se->gr->gg, bishan->ak","se->ak->df, hg->pp->sk") )

i need deal large amount of data optimization crucial.

thanks in advance.

edited

f<- data.frame( id=c("a","a","a","a","c","c","d","d","e"), mode=c("ak->se","se->ak->gg, bishan->k","ak->se","se->gr->gg, bishan->ak","ak->se","ak->ak->gg, bishan->ak","ak->se->ak->gg","se->gr->gg, bishan->ak","ak->ak->df, hg->pp->sk") )

using regular expression

f<- data.frame(   id=c("a","a","a","a","c","c","d","d","e"),   mode=c("ak->se","se->ak->gg, bishan->k","ak->se","se->gr->gg, bishan->ak","ak->se","se->gr->gg, bishan->ak","ak->se->ak->gg","se->gr->gg, bishan->ak","se->ak->df, hg->pp->sk") )  selection = grepl(pattern="^ak->.*ak->",x=f$mode,perl=true) f$mode[selection] f$id[selection]

using lapply (might bit slower if there lot of strings)

f<- data.frame(   id=c("a","a","a","a","c","c","d","d","e"),   mode=c("ak->se","se->ak->gg, bishan->k","ak->se","se->gr->gg, bishan->ak","ak->se","se->gr->gg, bishan->ak","ak->se->ak->gg","se->gr->gg, bishan->ak","se->ak->df, hg->pp->sk") )  selection = sapply(strsplit(x=f$mode,split="->"),fun=function(x) (x[1]=="ak")&(x[length(x)]!="ak")&(sum(x=="ak")>1)) f$mode[selection] f$id[selection]

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