Mastering Regular Expression

Regular expressions are an essential part of a programmer’s toolkit, available in various programming languages and almost all text editors such as Vim, Notepad++, Sublime, Visual Studio. Once you learn it, you discover it comes in handy in many places where you hadn't planned to use it, especially advanced searching and replacing text.

Have a look this Quick Start to get yourself up to speed quickly with regular expressions. Or read the book Mastering Regular Expression to learn how to use regular expression more efficiently.