Regular Expressions Cookbook, 2nd Edition by Jan Goyvaerts, Steven Levithan

A regular expression is useful to match strings of text, when you write programs or find particular character, word or pattern. That's simple you are supposed to know about regular expression. 

However, There is a book about regular expression, that tittle is Regular Expressions Cookbook by Jan Goyvaerts, Steven Levithan. It has 612 pages over 9 chapters. In this book, you will learn a lot of regular expression practicals, but readers ought to have programming skill. This book uses "Cookbook" on book title, but material in book is not easy to understand, if reader is newbie developer.

If you are developer and spend time to write code relate to regular expression. I still believe the example in book can help you for solutions. Each example, you will see solution and idea for each problem. Some problems authors have added programming language options (C#, Java, JavaScript, Perl, PHP, Python, Ruby, and VB.NET) as well.

If you read this book, You will know it easy to find each topic and idea. You can read topic which you are interested. You don't need to read all. 

Authors, they have experienced over 15 years with programming and regular expression. So, you will be able learn regular expression idea from them on this book.