说明：  在PHP网页开发的过程中用到了正则表达式，经过收集和整理形成了完整的笔记，有助于刚入门的开发人员使用，使用正则表达式能试很多字符串的处理简单很多
(In the process of PHP web development in the use of regular expressions, through collecting and sorting to form a complete notes, help novice developers to use, with the use of regular expressions can try many strings easier)