Add regular expression tutorial (#2536)

* 添加正则表达教程 * Update free-programming-books-zh.md
7 years ago · 1778451c1b
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 ### 正则表达式

+* [正则表达式-菜鸟教程](http://www.runoob.com/regexp/regexp-tutorial.html)
 * [正则表达式30分钟入门教程](http://deerchao.net/tutorials/regex/regex.htm)