Book Image

C# Programming Cookbook

By : Dirk Strauss
Book Image

C# Programming Cookbook

By: Dirk Strauss

Overview of this book

During your application development workflow, there is always a moment when you need to get out of a tight spot. Through a recipe-based approach, this book will help you overcome common programming problems and get your applications ready to face the modern world. We start with C# 6, giving you hands-on experience with the new language features. Next, we work through the tasks that you perform on a daily basis such as working with strings, generics, and lots more. Gradually, we move on to more advanced topics such as the concept of object-oriented programming, asynchronous programming, reactive extensions, and code contracts. You will learn responsive high performance programming in C# and how to create applications with Azure. Next, we will review the choices available when choosing a source control solution. At the end of the book, we will show you how to create secure and robust code, and will help you ramp up your skills when using the new version of C# 6 and Visual Studio
Table of Contents (21 chapters)
C# Programming Cookbook
Credits
About the Author
Acknowledgements
About the Reviewer
www.PacktPub.com
Preface
Index

Introduction


A regex is a pattern that describes a string through the use of special characters that denote a specific bit of text to match. The use of regex is not a new concept in programming. For regex to work, they need to use a regex engine that does all the heavy lifting.

In the .NET Framework, Microsoft has provided for the use of regex. To use regex, you will need to import the System.Text.RegularExpressions assembly to your project. This will allow the compiler to use your regex pattern and apply it to the specific text you need to match.

Secondly, regex have a specific set of metacharacters that hold special meaning to the Regex engine. These characters are [ ], { }, ( ), *, +, \, ?, |, $, . and, ^.

The use of the curly brackets { }, for example, enables developers to specify the number of times a specific set of characters need to occur. Using square brackets, on the other hand, defines exactly what needs to be matched.

If we, for example, specified [abc], the pattern would look for...