oracle字符串处理函数--待整理

http://www.cnblogs.com/xd502djj/archive/2010/08/11/1797577.html

http://blog.csdn.net/qq373591361/article/details/5658586

http://www.jb51.net/article/20975.htm

原文：http://www.cnblogs.com/yingsong/p/4536653.html