C语言的知识 比较全面 比较简单 涵盖了很多基本句法-C kowledge very good very easy.It includes some knowledge about it

正则表达式使用单个字符串来描述、匹配一系列符合某个句法规则的字符串。-Use regular expressions to describe a single string, in line with a series of syntactic rules match string.