转载：https://www.cnblogs.com/ggjucheng/archive/2013/01/13/2856896.html
参考 http://vbird.dic.ksu.edu.tw/linux_basic/0330regularex_2.php
http://www.cnblogs.com/stephen-liu74/archive/2011/11/14/2243694.html
转载：https://www.cnblogs.com/ggjucheng/archive/2013/01/13/2856896.html
参考 http://vbird.dic.ksu.edu.tw/linux_basic/0330regularex_2.php
http://www.cnblogs.com/stephen-liu74/archive/2011/11/14/2243694.html
