The problems presented in this chapter aren’t the kind of real-world problems that your boss or your customers ask you to solve. Rather, they’re technical problems you’ll encounter while creating and editing regular expressions to solve real-world problems. The first recipe, for example, explains how to match literal text with a regular expression. This isn’t a goal on its own, because you don’t need a regex when all you want to do is to search for literal text. But when creating a regular expression, you’ll likely need it to match certain text literally, and you’ll need to know which characters to escape. Recipe 2.1 tells you how.

The recipes start out with very basic regular expression techniques. If you’ve used regular expressions before, you can probably skim or even skip them. The recipes further down in this chapter will surely teach you something new, unless you have already read Mastering Regular Expressions by Jeffrey E. F. Friedl (O’Reilly) cover to cover.