Consistently Infrequent

November 7, 2011

Web Scraping Google URLs

Filed under: R — Tags: , , , , — Tony Breyal @ 2:18 pm

UPDATE: This function has now been improved, see googleSearchXScraper()

Google slightly changed the html code it uses for hyperlinks on search pages last Thursday, thus causing one of my scripts to stop working. Thankfully, this is easily solved in R thanks to the XML package and the power and simplicity of XPath expressions:

# load packages

get_google_page_urls <- function(u) {
  # read in page contents
  html <- getURL(u)

  # parse HTML into tree structure
  doc <- htmlParse(html)

  # extract url nodes using XPath. Originally I had used "//a[@href][@class='l']" until the google code change.
  links <- xpathApply(doc, "//h3//a[@href]", function(x) xmlAttrs(x)[[1]])

  # free doc from memory

  # ensure urls start with "http" to avoid google references to the search page
  links <- grep("http://", links, fixed = TRUE, value=TRUE)

u <- ""

# [1] ""
# [2] ""
# [3] ""
# [4] ""
# [5] ""
# [6] ""
# [7] ""
# [8] ""
# [9] ""

Lovely jubbly! 🙂

P.S. I know that there is an API of some sort for google search but I don’t think anyone has made an R package for it. Yet. (I feel my skill set is insufficient to do it myself!



  1. Very nice!

    If you’re curious, there is an API for Google Search, but it’s severely rate limited. I explained how to access it via R here:

    Comment by Noah — November 7, 2011 @ 5:54 pm

  2. Excellent script. The only missing part to me was the ability to read over the first page results. This can be achieved by adding “&start=x” at the end of the query, X being 10*(pageNumber-1), thus 0 for page 1, 10 for page 2 and so on. Here’s an ugly copy/paste of my ugly WIP.

    NbPageResults = 10*(NbPageResults – 1) <- paste("&start=", NbPageResults, sep="")

    GoogleURL <- paste(";,domain,
    search.term,, sep="")

    # read in page contents
    html <- getURL(GoogleURL)

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  14. That’s quite nice for lower amount of scraping. If you need to scrape large amounts of data I’d like to share my projects, they are open source and completely free!
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    Google Finance scraper:

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