正则 - 提取子串

11g版本：

 
 

  
  
WITHtAS
  
  
(
  
  
SELECT'((:1*:1)+:2)/:10'col
  
  
FROMdual
  
  
UNIONALL
  
  
SELECT'((:3*:0)+:323)/:1213lse12lj'FROMdual
  
  
)
  
  
SELECTcol,
  
  
regexp_substr(col,
  
  
'[0-9]+',
  
  
1,
  
  
LEVEL)ASdd,
  
  
LEVELASposition
  
  
FROMt
  
  
CONNECTBYLEVEL<=regexp_count(col,
  
  
'[0-9]+')AND
  
  
PRIORdbms_random.VALUEISNOTNULLAND
  
  
PRIORcol=col
  
  
ORDERSIBLINGSBYcol;
 
 

10g版本：

 
 

  
  
WITHtAS
  
  
(
  
  
SELECT'((:1*:1)+:2)/:10'col
  
  
FROMdual
  
  
UNIONALL
  
  
SELECT'((:3*:0)+:323)/:1213lse12lj'FROMdual
  
  
)
  
  
SELECTcol,
  
  
LEVELASposition
  
  
FROMt
  
  
CONNECTBYLEVEL<=(length(regexp_replace(col,
  
  
'[0-9]+',
  
  
'~~~'))-
  
  
length(REPLACE(regexp_replace(col,
  
  
'[0-9]+',
  
  
'~~~'),
  
  
'~~~')))/3AND
  
  
PRIORdbms_random.VALUEISNOTNULLAND
  
  
PRIORcol=col
  
  
ORDERSIBLINGSBYcol;