REGEXP_LIKE，REGEXP_INSTR，REGEXP_SUBSTR，REGEXP_REPLACE

参考：

1. http://www.cnblogs.com/scottckt/archive/2012/10/11/2719562.html
2. http://www.jb51.net/article/38426.htm

-- 创建表
create table REGLIKE
(
  id   NUMBER(3),
  name VARCHAR2(20)
);
--添加记录
insert into REGLIKE (id, name)
values (1, 'aaa111');
insert into REGLIKE (id, name)
values (2, 'aaa222');
insert into REGLIKE (id, name)
values (3, 'aaa333');
insert into REGLIKE (id, name)
values (4, '333aaa');
insert into REGLIKE (id, name)
values (5, '222aaa');
insert into REGLIKE (id, name)
values (6, '111aaa');
commit;
--使用
select * from reglike;
select * from reglike where regexp_like(name,'^[a-z]');
select * from reglike where regexp_like(name,'[a-z]$');
select REGEXP_INSTR (name,'[a-z]{3}') position from reglike ;
select REGEXP_SUBSTR (name,'[a-z]{3}') str from reglike ;
select REGEXP_REPLACE (name,'[a-z]{1}','bbb',2,2) str from reglike ;