Let's say that I have the following character vector with a series of url
strings. I'm interested in extracting some information from each string.

url = c("http://www.mdd.com/food/pizza/index.html", "
http://www.mdd.com/build-your-own/index.html",
        "http://www.mdd.com/special-deals.html", "
http://www.genius.com/find-a-location.html",
        "http://www.google.com/hello.html")

- First, I want to extract the domain name followed by .com. After
struggling with this for a while, reading some regular expression
tutorials, and reading through stack overflow, I came up with the following
solution. Perfect!

> parser <- function(x) gsub("www\\.", "", sapply(strsplit(gsub("http://",
"", x), "/"), "[[", 1))
> parser(url)
[1] "mdd.com"    "mdd.com"    "mdd.com"    "genius.com" "google.com"

- Second, I want to extract everything after .com in the original url.
Unfortunately, I don't know the proper regular expression to assign in
order to get the desired result. Can anyone help.

Output should be
/food/pizza/index.html
build-your-own/index.html
/special-deals.html

If anyone has a solution using the stringr package, that'd be of interest
also.


Thanks.

-- 

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