oracle利用正則表達式對字符串進行拆分

常規字符拆分方式

select REGEXP_SUBSTR(str, '[^,]+', 1, LEVEL) STR
  from (select '11,12,13,14,15,16' str from dual)
CONNECT BY LEVEL <= REGEXP_COUNT(str, '[^,]+');

 

使用特數字符拆分：

oracle文本中的換行符、回車符、制表符
制表符 chr(9)
換行符 chr(10)
回車符 chr(13)

換行符拆分示例：

with data_change as
(select REGEXP_SUBSTR(str, '[^' || chr(10) || ']+', 1, LEVEL) STR
from (select 'A
B
C
D
E' str
from dual)
CONNECT BY LEVEL <= REGEXP_COUNT(str, '[^' || chr(10) || ']+'))
select c.str from data_change c

 

示例：計算一個二進制字符串中連續為0的最大個數

select max(length(REGEXP_SUBSTR(str, '[^1]+', 1, LEVEL))) STR
  from (select '100010100000000' str from dual)
CONNECT BY LEVEL <= REGEXP_COUNT(str, '[^1]+');