Hi,
I'd like to match the beginning and the end of a string. E.g. I want to
extract all strings from a vector that beginn with "12" and end with
"Apples":
a <- "2 green Apples"
b <- "12 green Apples"
c <- "12 Apples and 2 green Bananas"
d <- "12 yellow Bananas"
fruitlist <- c(a,b,c,d)
# This is how to extract all that beginn with 12
grepl("^12",fruitlist)
But how can I get only those that also end with "Apples". So basically
just item b "12 green Apples" should remain.
Is there any clear description and examples of regular expressions
and how to use them? I find the manual ?grepl very difficult to read.
Thanks,
Johannes
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