Oracle基础教程：单行函数—正则表达式函数

正则表达式函数 (10g引入)
regexp_like('S','RE','O')
 S 被搜索的字符串或者列表达式
 RE 正则内容
 O 参数(可选)
idle> select ename from emp where regexp_like(ename,'S');

ENAME
----------
SMITH
JONES
SCOTT
ADAMS
JAMES

idle> select ename from emp where regexp_like(ename,'^S.*T');

ENAME
----------
SMITH
SCOTT

idle>

idle> select ename from emp where regexp_like(ename,'^s.*T$','i');忽略大小写

ENAME
----------
SCOTT

idle>

regexp_replace(S,'RE','NEW')
idle> select ename,regexp_replace(ename,'S..T','=') aaa from emp where regexp_like (ename,'S..T');

ENAME    AAA
---------- ----------
SMITH    =H
SCOTT    =T

idle>

regexp_replace(S,'RE','NEW')
idle> select ename,regexp_replace(ename,'S.*T','=') aaa from emp where regexp_like (ename,'S.*T');

ENAME    AAA
---------- ----------
SMITH    =H
SCOTT    =

idle>