Hi
I am trying to extract only the text contained in brackets from a vector of
strings
not all of the strings contain closed bracketed text, they should return an
empty string or NA
this is what I have at the moment
mystrings<-c("ABC","A(B)C","AB(C)")
substring(mystrings, regexpr("\\(|\\)", mystrings))
#this returns the whole string if there are no brackets.
[1] "ABC" "(B)C" "(C)"
# my desired desired output:
# [1] "" "(B)" "(C)"
many thanks for any suggestions
Nevil Amos
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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.
