In this chapter, we talked about the important rules of RegEx and Xpath. We talked about the general idea of web scraping and web crawling. We then described web scraping techniques, methodologies, and frameworks, before finally introducing the various web scraping environments that are available in R.
In the next chapter, we will learn about XPath rules. We will focus on XPath methodology and how to write XPath rules. We will then learn about the main idea behind these rules and put them into practice. After writing our first RegEx and Xpath rules, we will jump into writing our first web scraper by using R. The RSelenium and rvest libraries are going to be used throughout this book.