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reg expr that retains only bracketed text from strings

Jim Lemon 
Hi Nevil,
In case you are still having trouble with this, I wrote something in R
that should do what you want:

mystrings<-c("ABC","A(B)C","AB[C]","<A>BC","{AB}C")

get_enclosed<-function(x,left=c("(","[","<","{"),right=c(")","]",">","}")) {
 newx<-rep("",length(x))
 for(li in 1:length(left)) {
  for(xi in 1:length(x)) {
   lp<-regexpr(left[li],x[xi],fixed=TRUE)
   rp<-regexpr(right[li],x[xi],fixed=TRUE)
   if(lp > 0 && rp > 0)
    newx[xi]<-substr(x[xi],lp+1,rp-1)
  }
 }
 return(newx)
}
get_enclosed(mystrings)

Jim

On Thu, Jun 13, 2019 at 12:32 AM William Dunlap via R-help
<r-help at r-project.org> wrote:

Thread (5 messages)

Nevil Amos reg expr that retains only bracketed text from strings Jun 11 Eric Berger reg expr that retains only bracketed text from strings Jun 12 Ivan Krylov reg expr that retains only bracketed text from strings Jun 12 William Dunlap reg expr that retains only bracketed text from strings Jun 12 Jim Lemon reg expr that retains only bracketed text from strings Jun 12