Book Image

Javascript Regular Expressions

Book Image

Javascript Regular Expressions

Overview of this book

This book is ideal for JavaScript developers and programmers who work with any type of user entry data and want sharpen their skills to become experts.
Table of Contents (8 chapters)

Getting started with our application


Let's start developing our sample application with Node.js, which will read a log file and parse its information using a regular expression. We are going to create all the required code inside a JavaScript file, which we will name as regex.js. Before we start coding, we will perform a simple test. Add the following content inside the regex.js:

console.log('Hello, World!');

Next, in the terminal application, execute the regex.js command node from the directory that the file was created in. The Hello, World! message should be displayed as follows:

The hello world application with Node.js is created and it works! We can now start coding our application.

Reading a file with Node.js

As the main goal of our application is to read a file, we need the file that the application is going to read! We will be using a sample Apache log file. There are many files on the Internet, but we will be using the log file that can be downloaded from http://fossies.org/linux/source...