A hands on guide to web scraping and text mining for both  beginners and experienced users of R
    - Introduces fundamental concepts of the main architecture of the  web and databases and covers HTTP, HTML, XML, JSON, SQL.
   - Provides basic techniques to query web documents and data sets  (XPath and regular expressions).
   - An extensive set of exercises are presented to guide the  reader through each technique.
   - Explores both supervised and unsupervised techniques as well as  advanced techniques such as data scraping and text management.
   - Case studies are featured throughout along with examples for  each technique presented.
   - R code and solutions to exercises featured in the  book are provided on a supporting website.