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.

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• 介绍了网络和数据库主要架构的基本概念，涵盖HTTP、HTML、XML、JSON、SQL。
• 提供查询网络文档和数据集的基本技术（XPath和正则表达式）。
• 提供了大量的练习，以指导读者学习每一种技术。
• 探讨了有监督和无监督的技术以及高级技术，如数据采集和文本管理。
• 案例研究与所介绍的每项技术的例子一起贯穿始终。
• 书中的R代码和练习题的解决方案在一个辅助网站上提供。