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Modern R Programming Cookbook

You're reading from   Modern R Programming Cookbook Recipes to simplify your statistical applications

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Product type Paperback
Published in Oct 2017
Publisher Packt
ISBN-13 9781787129054
Length 236 pages
Edition 1st Edition
Languages
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Author (1):
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Jaynal Abedin Jaynal Abedin
Author Profile Icon Jaynal Abedin
Jaynal Abedin
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Toc

Table of Contents (10) Chapters Close

Preface 1. Installing and Configuring R and its Libraries FREE CHAPTER 2. Data Structures in R 3. Writing Customized Functions 4. Conditional and Iterative Operations 5. R Objects and Classes 6. Querying, Filtering, and Summarizing 7. R for Text Processing 8. R and Databases 9. Parallel Processing in R

Using regular expression in text processing

A regular expression is simply a sequence of character strings that defines the search pattern. In natural language, processing and text mining are the two areas where regular expressions are used a lot. There are other application areas as well. In this recipe, you will perform text data pre-processing without using the tm library but by using a regular expression.

Getting ready

Suppose you have a corpus of documents and your objective is to find the frequent words in the corpus. So, the first thing is to do the pre-processing and then create term a document matrix. In this recipe, you will use a regular expression on the text data retrieved from a web page using the readLines(...

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