Regular expression system tutorial (1)

1. at present, regular expressions have been widely used in many software applications, including * nix (Linux, Unix, etc.), HP and other operating systems, PHP, C #, Java and other development environments, and many applications can see the shadow of regular expressions. You can use SyntaxHighlighter. al in a simple way to use regular expressions.

1. Introduction
At present, regular expressions have been widely used in many software applications, including * nix (Linux, Unix, etc.), HP and other operating systems, PHP, C #, Java and other development environments, and many applications can see the shadow of regular expressions.

The use of regular expressions can be implemented in a simple way. In order to be simple, effective, and powerful, it makes the regular expression code more difficult and difficult to learn. Therefore, you need to make some effort. after getting started, refer to some references, it is relatively simple and effective to use.

Example: ^. + @. + \... + $

Such code has been used to scare me out many times. Many people may be scared away by such code. Continue reading this article to allow you to freely apply such code.

Note: Part 1 here seems to be a bit repetitive, with the aim of re-describing the content in the previous table to make it easier to understand.