[R] regular expressions : extracting numbers

[Christian Ritz]

Dear David,

does the following work for you?


sVec <- c("lema, rb 2%", "rb 2%", "rb 3%", "rb 4%", "rb 3%", "rb 2%,mineuse", "rb", "rb", 
"rb 12", "rb", "rj 30%", "rb", "rb", "rb 25%", "rb", "rb", "rb", "rj, rb")

reVec <- regexpr("[[:digit:]]+", sVec)
# see ?regex for details on '[:digit:]' and '+'

substr(sVec ,start = reVec, stop=reVec + attr(reVec, "match.length") - 1)
# see ?substr for details



Christian