[R] regex pattern assistance

[arun]

Hi Tom,
You could try:
library(stringr)
str_extract(x, perl("(?<=[A-Za-z]{4}/).*(?=/[0-9])"))
#[1] "S01-012"
A.K.



On Friday, August 15, 2014 12:20 PM, Tom Wright <tom at maladmin.com> wrote:
Hi,
Can anyone please assist.

given the string 

> x<-"/mnt/AO/AO Data/S01-012/120824/"

I would like to extract "S01-012"

require(stringr)
> str_match(x,"\\/mnt\\/AO\\/AO Data\\/(.+)\\/+")
> str_match(x,"\\/mnt\\/AO\\/AO Data\\/(\\w+)\\/+")

both nearly work. I expected I would use something like:
> str_match(x,"\\/mnt\\/AO\\/AO Data\\/([\\w -]+)\\/+")

but I don't seem able to get the square bracket grouping to work
correctly. Can someone please show me where I am going wrong?

Thanks,
Tom

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