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2 changes: 1 addition & 1 deletion lesson9/README.md
Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,7 @@ var web_development = "python php ruby javascript jsonp perhapsphpisoutdated";

开始这门课之前,大家先去看两篇文章。

《正则表达式30分钟入门教程》:http://deerchao.net/tutorials/regex/regex.htm
《正则表达式30分钟入门教程》:https://www.gitbook.com/book/luke0922/learnregularexpressionin30minutes/details

上面这篇介绍了正则表达式的基础知识,但是对于零宽断言没有展开来讲,零宽断言看下面这篇:

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