Quick: If you shout "regular expressions" in a crowd of Linux users, what happens? Answer: Everyone will tell you the right way to use them, and every answer will be different. Regular expressions ...

This article explains what regex (or regular expressions) is and how to get started using it with web crawlers, plus some interesting real-world use cases.

In this lesson, you’ll learn how to use RegEx (regular expressions) to work with sets of characters. Unlike the ., which matches any single character , sets enable you to match specific ...