Screen Scraping with Ruby
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Screen scraping with Ruby involves using XPath to select elements from an XML or HTML document, and Ruby tools like Open-URI, REXML, Hpricot and WWW::Mechanize to extract data from websites. The process involves finding XPaths using Firebug, testing regular expressions with Rubular, refining selections in IRB, and using string methods to clean extracted data. Comments should be added as the code becomes more complex with regular expressions and functions.
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![XPATH basics //book -- selects all book nodes no matter where they are in the document //bookstore/book selects all books that are a direct child element of bookstore //bookstore//book selects all books that are children of bookstore, no matter how deep in tree //book[1] - selects first book element //book@category =fiction -- @ selects an attribute, in this case specifically fiction books](https://image.slidesharecdn.com/rubyscraping-1224279840704248-8/85/Screen-Scraping-with-Ruby-4-320.jpg)
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Realigning leadership roles in AI-driven organizations
Ethical challenges in using AI for leadership decisions
Promoting employee engagement and continuous learning in the AI era
Creating a corporate culture that unites innovation and responsible AI use
Practical strategies for integrating AI tools into agile leadership approaches
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Screen Scraping with Ruby
- 1. Screen Scraping with Ruby Jeremy Raines [email_address]
- 2. Pre-Reqs XPATH Used for addressing elements in an XML doc http://www.w3schools.com/XPath/default.asp Ruby Regular Expressions www.rubular.com -- fastest way to build rope-swinging regex skills in Ruby
- 3. Rubular Input a string and try out regexs on it
- 4. XPATH basics //book -- selects all book nodes no matter where they are in the document //bookstore/book selects all books that are a direct child element of bookstore //bookstore//book selects all books that are children of bookstore, no matter how deep in tree //book[1] - selects first book element //book@category =fiction -- @ selects an attribute, in this case specifically fiction books
- 5. Not-so-secret weapon: Firebug Lets you find the Xpath of any element in a web page. Inspect Element of a representative item Focus on classes, think about loops This will produce easier to read xpaths
- 6. Example
- 7. Example (con't) //sbScoreboxScores//sbScoreboxTeamAway //sbScoreboxScores//sbScoreboxTotal
- 8. How do we get at the data in these elements using Ruby? Open-uri built-in library for opening pages REXML built-in Xpath parser Fast, good for straightforward tasks Hpricot popular gem More powerful, I usually use in conjuction with: WWW::Mechanize For getting at data behind forms. Requires Hpricot ScRUBYt! -- powerful, high-level abstraction, magic
- 9. My Process Find a good source Use firebug to determine Xpaths of the elements you want to scrape Play around in irb to see what kind of output you can get from addressing these elements with aforementioned tools Refine Xpaths Play around in Rubular to find regexes that will clean up your output (remove whitespace, etc) Ruby's string methods help with this last part
- 10. Example: Scraping Quotes from your Tumblr
- 11. Warning Screen scraping is very iterative & involves a lot of trial and error Make sure you comment a lot as you go along Even with clear Xpaths, it's best to describe what your code is doing with all the regexes and string functions that inevitably build up
- 12. References http://www.igvita.com/2007/02/04/ruby-screen-scraper-in-60-seconds/ Inspiration for this presentation Describes the Firebug + hpricot method http://code.whytheluckystiff.net/hpricot/wiki http://www.rubyrailways.com/data-extraction-for-web-20-screen-scraping-in-rubyrails/ http://www.xml.com/pub/a/2005/11/09/rexml-processing-xml-in-ruby.html http://mechanize.rubyforge.org/mechanize/files/EXAMPLES_txt.html WWW::Mechanize examples For an example that requires Mechanize for logging in, check out my code for logging into LinkedIn and scraping all your 2 nd degree contacts jeremyraines.com/linkedinscraper