最近老师要求自己研究正则表达式的内容，并推荐了一个老外女博士wikipedia类型的网站(http://regex.wustl.edu/index.php/Main_Page)，说上面有很好的相关论文与程序源码。去网站看了下，貌似确实挺有名气，很多著名的公司都对其程序有引用应用。只是郁闷的是，绝大部分内容需要注册账号才能查看，而注册账号需要发邮件说明原因。

英语很菜的我只好找了篇范例来改改啦，还好很快就获得了允许。这里不得不说下老外的认真与效率，下午四点多发过去的，夜晚八九点（貌似美国那边此时是清晨的？）就收到了回复。

下面是参考的一篇范例，列出来以作参考与备份了。

看到老外一篇控制方面的文章写得很好，想验证他的仿真结果,但是怎么也做不出来，所以希望得到老外的源程序(一般是C++语言或matlab语言)，下面是我写给老外的信，敬请帮忙指正,谢谢!

Subject:Ask for source program
Dear prof. XXX,
I am a graduate student of XXX University in China. My research is focused on Signal and Information Processing. I have recently read your paper “XXX”, which appeared in “XXX”. I have trid to validate your simulation results show in Fig.3 for a long time, but no progress. I am wondering if you could kindly send me the source program and the necessary information about it. I promise they will be used only for research purposes.

Thank you very much for your kind consideration and I am looking forward to your early reply.

Sincerely, yours
XXXX