input <- c("Start>=8.5", "Start< 14.5", "x == 4", "tmp >= 7", "ff =11", "x<=2") strsplit(input, '(?<=[><=])(?=[^><=])|(?<=[^><=])(?=[><=])', perl = TRUE)
Standard input is empty
[[1]] [1] "Start" ">=" "8.5" [[2]] [1] "Start" "<" " 14.5" [[3]] [1] "x " "==" " 4" [[4]] [1] "tmp " ">=" " 7" [[5]] [1] "ff " "=" "11" [[6]] [1] "x" "<=" "2"