oracle 正则表达式?= Oracle正则表达式

oracle \u7684\u6b63\u5219\u8868\u8fbe\u5f0f

oracle\u7684\u6b63\u5219\u8868\u8fbe\u5f0f(10g\u624d\u53ef\u4ee5\u7528)

oracle\u7684\u6b63\u5219\u8868\u8fbe\u5f0f(regular expression)\u7b80\u5355\u4ecb\u7ecd
\u76ee\u524d\uff0c\u6b63\u5219\u8868\u8fbe\u5f0f\u5df2\u7ecf\u5728\u5f88\u591a\u8f6f\u4ef6\u4e2d\u5f97\u5230\u5e7f\u6cdb\u7684\u5e94\u7528\uff0c\u5305\u62ec*nix\uff08Linux, Unix\u7b49\uff09\uff0cHP\u7b49\u64cd\u4f5c\u7cfb\u7edf\uff0cPHP\uff0cC#\uff0cJava\u7b49\u5f00\u53d1\u73af\u5883\u3002
Oracle 10g\u6b63\u5219\u8868\u8fbe\u5f0f\u63d0\u9ad8\u4e86SQL\u7075\u6d3b\u6027\u3002\u6709\u6548\u7684\u89e3\u51b3\u4e86\u6570\u636e\u6709\u6548\u6027\uff0c\u91cd\u590d\u8bcd\u7684\u8fa8\u8ba4, \u65e0\u5173\u7684\u7a7a\u767d\u68c0\u6d4b\uff0c\u6216\u8005\u5206\u89e3\u591a\u4e2a\u6b63\u5219\u7ec4\u6210\u7684\u5b57\u7b26\u4e32\u7b49\u95ee\u9898\u3002
Oracle 10g\u652f\u6301\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u56db\u4e2a\u65b0\u51fd\u6570\u5206\u522b\u662f\uff1aREGEXP_LIKE\u3001REGEXP_INSTR\u3001REGEXP_SUBSTR\u3001\u548cREGEXP_REPLACE\u3002
\u5b83\u4eec\u4f7f\u7528POSIX \u6b63\u5219\u8868\u8fbe\u5f0f\u4ee3\u66ff\u4e86\u8001\u7684\u767e\u5206\u53f7\uff08%\uff09\u548c\u901a\u914d\u7b26\uff08_\uff09\u5b57\u7b26\u3002
\u7279\u6b8a\u5b57\u7b26\uff1a
'^' \u5339\u914d\u8f93\u5165\u5b57\u7b26\u4e32\u7684\u5f00\u59cb\u4f4d\u7f6e\uff0c\u5728\u65b9\u62ec\u53f7\u8868\u8fbe\u5f0f\u4e2d\u4f7f\u7528\uff0c\u6b64\u65f6\u5b83\u8868\u793a\u4e0d\u63a5\u53d7\u8be5\u5b57\u7b26\u96c6\u5408\u3002
'$' \u5339\u914d\u8f93\u5165\u5b57\u7b26\u4e32\u7684\u7ed3\u5c3e\u4f4d\u7f6e\u3002\u5982\u679c\u8bbe\u7f6e\u4e86 RegExp \u5bf9\u8c61\u7684 Multiline \u5c5e\u6027\uff0c\u5219 $ \u4e5f\u5339\u914d '\n' \u6216'\r'\u3002
'.' \u5339\u914d\u9664\u6362\u884c\u7b26 \n\u4e4b\u5916\u7684\u4efb\u4f55\u5355\u5b57\u7b26\u3002
'?' \u5339\u914d\u524d\u9762\u7684\u5b50\u8868\u8fbe\u5f0f\u96f6\u6b21\u6216\u4e00\u6b21\u3002
'*' \u5339\u914d\u524d\u9762\u7684\u5b50\u8868\u8fbe\u5f0f\u96f6\u6b21\u6216\u591a\u6b21\u3002
'+' \u5339\u914d\u524d\u9762\u7684\u5b50\u8868\u8fbe\u5f0f\u4e00\u6b21\u6216\u591a\u6b21\u3002
'( )' \u6807\u8bb0\u4e00\u4e2a\u5b50\u8868\u8fbe\u5f0f\u7684\u5f00\u59cb\u548c\u7ed3\u675f\u4f4d\u7f6e\u3002
'[]' \u6807\u8bb0\u4e00\u4e2a\u4e2d\u62ec\u53f7\u8868\u8fbe\u5f0f\u3002
'{m,n}' \u4e00\u4e2a\u7cbe\u786e\u5730\u51fa\u73b0\u6b21\u6570\u8303\u56f4\uff0cm=<\u51fa\u73b0\u6b21\u6570<=n\uff0c'{m}'\u8868\u793a\u51fa\u73b0m\u6b21\uff0c'{m,}'\u8868\u793a\u81f3\u5c11\u51fa\u73b0m\u6b21\u3002
'|' \u6307\u660e\u4e24\u9879\u4e4b\u95f4\u7684\u4e00\u4e2a\u9009\u62e9\u3002\u4f8b\u5b50'^([a-z]+|[0-9]+)$'\u8868\u793a\u6240\u6709\u5c0f\u5199\u5b57\u6bcd\u6216\u6570\u5b57\u7ec4\u5408\u6210\u7684\u5b57\u7b26\u4e32\u3002
\num \u5339\u914d num\uff0c\u5176\u4e2d num \u662f\u4e00\u4e2a\u6b63\u6574\u6570\u3002\u5bf9\u6240\u83b7\u53d6\u7684\u5339\u914d\u7684\u5f15\u7528\u3002
\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u4e00\u4e2a\u5f88\u6709\u7528\u7684\u7279\u70b9\u662f\u53ef\u4ee5\u4fdd\u5b58\u5b50\u8868\u8fbe\u5f0f\u4ee5\u540e\u4f7f\u7528\uff0c\u88ab\u79f0\u4e3aBackreferencing. \u5141\u8bb8\u590d\u6742\u7684\u66ff\u6362\u80fd\u529b
\u5982\u8c03\u6574\u4e00\u4e2a\u6a21\u5f0f\u5230\u65b0\u7684\u4f4d\u7f6e\u6216\u8005\u6307\u793a\u88ab\u4ee3\u66ff\u7684\u5b57\u7b26\u6216\u8005\u5355\u8bcd\u7684\u4f4d\u7f6e. \u88ab\u5339\u914d\u7684\u5b50\u8868\u8fbe\u5f0f\u5b58\u50a8\u5728\u4e34\u65f6\u7f13\u51b2\u533a

\u4e2d\uff0c\u7f13\u51b2\u533a\u4ece\u5de6\u5230\u53f3\u7f16\u53f7, \u901a\u8fc7\\u6570\u5b57\u7b26\u53f7\u8bbf\u95ee\u3002 \u4e0b\u9762\u7684\u4f8b\u5b50\u5217\u51fa\u4e86\u628a\u540d\u5b57 aa bb cc \u53d8\u6210cc, bb, aa.
Select REGEXP_REPLACE('aa bb cc','(.*) (.*) (.*)', '\3, \2, \1') FROM dual\uff1b
REGEXP_REPLACE('ELLENHILDISMIT
cc, bb, aa
'\' \u8f6c\u4e49\u7b26\u3002
\u5b57\u7b26\u7c07\uff1a
[[:alpha:]] \u4efb\u4f55\u5b57\u6bcd\u3002
[[:digit:]] \u4efb\u4f55\u6570\u5b57\u3002
[[:alnum:]] \u4efb\u4f55\u5b57\u6bcd\u548c\u6570\u5b57\u3002
[[:space:]] \u4efb\u4f55\u767d\u5b57\u7b26\u3002
[[:upper:]] \u4efb\u4f55\u5927\u5199\u5b57\u6bcd\u3002
[[:lower:]] \u4efb\u4f55\u5c0f\u5199\u5b57\u6bcd\u3002
[[unct:]] \u4efb\u4f55\u6807\u70b9\u7b26\u53f7\u3002
[[:xdigit:]] \u4efb\u4f5516\u8fdb\u5236\u7684\u6570\u5b57\uff0c\u76f8\u5f53\u4e8e[0-9a-fA-F]\u3002
\u5404\u79cd\u64cd\u4f5c\u7b26\u7684\u8fd0\u7b97\u4f18\u5148\u7ea7
\ \u8f6c\u4e49\u7b26
(), (?, (?=), [] \u5706\u62ec\u53f7\u548c\u65b9\u62ec\u53f7
*, +, ?, {n}, {n,}, {n,m} \u9650\u5b9a\u7b26
^, $, \anymetacharacter \u4f4d\u7f6e\u548c\u987a\u5e8f
| \u201c\u6216\u201d\u64cd\u4f5c
--\u6d4b\u8bd5\u6570\u636e
create table test(mc varchar2(60));
insert into test values('112233445566778899');
insert into test values('22113344 5566778899');
insert into test values('33112244 5566778899');
insert into test values('44112233 5566 778899');
insert into test values('5511 2233 4466778899');
insert into test values('661122334455778899');
insert into test values('771122334455668899');
insert into test values('881122334455667799');
insert into test values('991122334455667788');
insert into test values('aabbccddee');
insert into test values('bbaaaccddee');
insert into test values('ccabbddee');
insert into test values('ddaabbccee');
insert into test values('eeaabbccdd');
insert into test values('ab123');
insert into test values('123xy');
insert into test values('007ab');
insert into test values('abcxy');
insert into test values('The final test is is is how to find duplicate words.');
commit;
\u4e00\u3001REGEXP_LIKE
select * from test where regexp_like(mc,'^a{1,3}');
select * from test where regexp_like(mc,'a{1,3}');
select * from test where regexp_like(mc,'^a.*e$');
select * from test where regexp_like(mc,'^[[:lower:]]|[[:digit:]]');
select * from test where regexp_like(mc,'^[[:lower:]]');
Select mc FROM test Where REGEXP_LIKE(mc,'[^[:digit:]]');
Select mc FROM test Where REGEXP_LIKE(mc,'^[^[:digit:]]');
\u4e8c\u3001REGEXP_INSTR
Select REGEXP_INSTR(mc,'[[:digit:]]$') from test;
Select REGEXP_INSTR(mc,'[[:digit:]]+$') from test;
Select REGEXP_INSTR('The price is $400.','\$[[:digit:]]+') FROM DUAL;
Select REGEXP_INSTR('onetwothree','[^[[:lower:]]]') FROM DUAL;
Select REGEXP_INSTR(',,,,,','[^,]*') FROM DUAL;
Select REGEXP_INSTR(',,,,,','[^,]') FROM DUAL;
\u4e09\u3001REGEXP_SUBSTR
SELECT REGEXP_SUBSTR(mc,'[a-z]+') FROM test;
SELECT REGEXP_SUBSTR(mc,'[0-9]+') FROM test;
SELECT REGEXP_SUBSTR('aababcde','^a.*b') FROM DUAL;
\u56db\u3001REGEXP_REPLACE
Select REGEXP_REPLACE('Joe Smith','( ){2,}', ',') AS RX_REPLACE FROM dual;
Select REGEXP_REPLACE('aa bb cc','(.*) (.*) (.*)', '\3, \2, \1') FROM dual\uff1b

Oracle\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u5e94\u7528\u5728oracle\u91cc\u6b63\u5219\u8868\u8fbe\u5f0f\u6709\u56db\u4e2a\u51fd\u6570\u53ef\u7528\uff0c\u5206\u522b\u662fregexp_like\u3001regexp_substr\u3001regexp_instr \u548cregexp_replace\u3002\u8fd9\u91cc\u5728\u6211\u4eecoracle 10g\u91cc\u7075\u6d3b\u5e94\u7528\u3002 \u5148\u6765\u7b80\u5355\u4ecb\u7ecd\u4e00\u4e0b\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u5185\u5bb9\uff0c\u6b63\u5219\u8868\u8fbe\u5f0f\u662f\u505a\u4e3a\u5feb\u901f\u67e5\u8be2\u7684\u6587\u672c\u5185\u5bb9\u7684\uff0c\u5728linux\u5e94\u7528\u6bd4\u8f83\u591a\uff0c\u9996\u5148\uff0c\u884c\u7684\u8d77\u59cb\u4e0e\u7ed3\u675f \u201c^\u201d\u8fd9\u4e2a\u5b57\u7b26\u662f\u8868\u793a\u53ea\u67e5\u627e\u884c\u9996\u7684\u5185\u5bb9\u3002\u201c$\u201d\u8fd9\u4e2a\u5b57\u7b26\u53ea\u67e5\u627e\u884c\u672b\u7684\u5185\u5bb9\u3002\u63a5\u4e0b\u6765\u662f\u201c^\u201d\u8fd8\u53ef\u4ee5\u505a\u4e3a\u4e00\u4e2a\u6392\u9664\u5b57\u7b26\u6765\u4f7f\u7528\u3002\u8fd8\u662f\u4f7f\u7528\u4f8b\u5b50\u6765\u505a\u4e00\u4e2a\u6f14\u793a\u6bd4\u8f83\u660e\u4e86\u4e00\u4e0b\u3002 \u8fd9\u91cc\u6211\u4f7f\u7528regexp_like\u8fd9\u4e2a\u51fd\u6570\u6765\u505a\uff0c\u8fd9\u6837\u53ef\u4ee5\u6211\u4eec\u5e73\u65f6\u4f1a\u4f7f\u7528\u7684\u6bd4\u8f83\u591a\u3002select * from test_tablewhere regexp_like(field_1,'^1234')\u8fd9\u4e2a\u5c31\u662f\u8868\u793a\u662f\u4ee51234\u6253\u5934\u7684\u5b57\u7b26\u4e32\u662f\u4e0d\u662f\u6709\u5339\u914d\u7684\u3002\u8fd9\u91cc\u548clike\u7684\u65b9\u5f0f\u662f\u4e00\u6837\u7684\u3002 select * from test_tablewhere regexp_like(field_1,'^[12]234')\u8fd9\u91cc\u591a\u4e86\u4e00\u4e2a[]\u8fd9\u91cc\u505a\u4e00\u4e2a\u72ec\u7acb\u5b57\u7b26\uff0c\u8fd9\u91cc\u8868\u793a\u662f\u4ee51\u62162\u5f00\u59cb\uff0c\u5e76\u4e14\u63a5\u7740\u662f234\u8fd9\u4e2a\u91cc\u7684\u5b57\u7b26\u5c31\u4f1a\u662f\u5339\u914d\u7684\u3002 select * from test_tablewhere regexp_like(field_1,'^(\u6b27\u9633|\u674e)\u5c0f\u4e8c')\u8fd9\u91cc\u6211\u4eec\u5c31\u53ef\u4ee5\u8868\u8fbe\uff0c\u8fd9\u4e2a\u67e5\u8be2\u4e00\u4e2a\u59d3\u662f\u6b27\u9633\u6216\u674e\u7684\uff0c\u540d\u5b57\u53eb\u5c0f\u4e8c\u7684\u5b57\u7b26\u4e32\u3002\u8fd9\u91cc\u591a\u4e86\u4e00\u4e2a\uff08\uff09\u8fd9\u4e2a\u662f\u505a\u4e00\u4e2a\u4e3a\u5b57\u7b26\u4e32\u7684\u65b9\u5f0f\u6765\u5199\u7684\u4e0e[]\u521a\u597d\u662f\u5bf9\u5e94\u3002\u8fd9\u91cc\u8fd8\u6709\u4e00\u4e2a\u201c|\u201d\u6765\u8868\u793a\u6216\u7684\u610f\u601d\u3002 select * from test_tablewhere regexp_like(field_1,'^\u674e[\u5c0f]*\u4e8c')\u8fd9\u91cc\u6211\u4eec\u5c31\u53ef\u4ee5\u67e5\u8be2\u674e\u5c0f\u4e8c\u6216\u662f\u674e\u4e8c\uff0c\u518d\u6216\u8005\u662f\u674e\u5c0f\u5c0f\u4e8c\uff0c\u90fd\u53ef\u4ee5\uff0c\u8fd9\u91cc\u6211\u4eec\u9700\u8981\u8bb2\u4e00\u4e0b\u662f[]\u540e\u9762\u5e26\u4e86\u4e00\u4e2a*\uff0c\u8fd9\u4e2a\u662f\u8868\u793a0~\u65e0\u7a77\u5927 \u5b57\u7b26\u53bb\u5339\u914d\u3002\u8fd9\u4e2a[]\u6211\u4eec\u8fd8\u53ef\u4ee5\u6dfb\u52a0\u4e00\u4e2a\u201c+\u201d\u6765\u8868\u793a1~\u65e0\u7a77\u5927\u7684\u5b57\u7b26\u53bb\u5339\u914d\uff0c\u4e5f\u53ef\u4ee5\u66f4\u52a0\u7cbe\u51c6\u4e00\u4e9b\uff0c\u5728[]\u540e\u9762{1,3}\u8fd9\u91cc\u5c31\u662f\u8868\u793a1\u4e2a\u52303\u4e2a\u76f8\u540c\u5b57\u7b26\u7684\u5339\u914d\u3002\u8fd8\u6709\u4e00\u4e2a\u201c?\u201d\u6765\u8bf4\u8868\u793a1\u6216\u662f0\u4e2a\u3002 select * from test_tablewhere regexp_like(field_1,'\u674e[^\u5c0f]\u4e8c')\u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u67e5\u8be2\u5230\u59d3\u674e\u7684\uff0c\u4f46\u662f\u7b2c\u4e8c\u5b57\u4e0d\u662f\u201c\u5c0f\u201d\u8fd9\u4e2a\u5b57\u3002 select * from test_tablewhere regexp_like(field_1,'[0-9]')\u8fd9\u91cc\u662f\u8868\u793a\u6211\u4eec\u67e5\u8be2\u5b57\u7b26\u4e32\u542b\u67090-9\u7684\u6570\u5b57\u7684\u5b57\u7b26\u4e32\u3002 select * from test_tablewhere regexp_like(field_1,'[a-z]')\u8fd9\u91cc\u662f\u8868\u793a\u6211\u4eec\u67e5\u8be2\u5b57\u7b26\u4e32\u542b\u6709a-z\u7684\u5c0f\u5199\u5b57\u6bcd\u7684\u5b57\u7b26\u4e32\u3002 select * from test_tablewhere regexp_like(field_1,'[A-z]')\u8fd9\u91cc\u662f\u8868\u793a\u6211\u4eec\u67e5\u8be2\u5b57\u7b26\u4e32\u542b\u6709A-z\u7684\u6240\u6709\u5b57\u6bcd\u7684\u5b57\u7b26\u4e32\u3002 select * from test_tablewhere regexp_like(name,'[[:alpha:]]')\u8fd9\u91cc\u662f\u8868\u793a\u67e5\u8be2\u5339\u914d\u4efb\u610f\u5b57\u6bcd\uff0c\u4e5f\u5305\u62ec\u4e2d\u6587\u5b57 select * from test_tablewhere regexp_like(name,'[[:alnum:]]')\u8fd9\u91cc\u662f\u8868\u793a\u67e5\u8be2\u5339\u914d\u4efb\u610f\u5b57\u6bcd\u548c\u6570\u5b57 select * from test_tablewhere regexp_like(name,'[[:digit:]]')\u8fd9\u91cc\u662f\u8868\u793a\u67e5\u8be2\u5339\u914d\u4efb\u610f\u6570\u5b57 Select * from test_tableWhere regexp_like(name,\u2019of\u2019,\u2019i\u2019)\u8fd9\u91cc\u5c31\u662fof\u4e0d\u533a\u5206\u5927\u5c0f\u5199 Select * from test_tableWhere regexp_like(name,\u2019^[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}$\u2019)\u8fd9\u6837\u6211\u4eec\u53ef\u4ee5\u67e5\u8be2\u662f\u4e0d\u662fip\u683c\u5f0f \u63a5\u4e0b\u6765\u4ecb\u7ecd\u4e00\u4e0bregexp_substr\u8fd9\u4e2a\u4e5f\u662f\u4e00\u4e2a\u975e\u5e38\u5b9e\u7528\u7684\u4e00\u4e2a\u51fd\u6570 REGEXP_SUBSTR\u4e0eSUBSTR\u51fd\u6570\u76f8\u540c\uff0c\u8fd4\u56de\u622a\u53d6\u7684\u5b50\u5b57\u7b26\u4e32 REGEXP_SUBSTR(srcstr, pattern [, position [, occurrence [, match_option]]]) \u6ce8\uff1a srcstr \u6e90\u5b57\u7b26\u4e32 pattern \u6b63\u5219\u8868\u8fbe\u5f0f\u6837\u5f0f position \u5f00\u59cb\u5339\u914d\u5b57\u7b26\u4f4d\u7f6e occurrence \u5339\u914d\u51fa\u73b0\u6b21\u6570 match_option \u5339\u914d\u9009\u9879\uff08\u533a\u5206\u5927\u5c0f\u5199\uff09 SELECT regexp_substr('1PSN/231_3253/ABc', '[[:alnum:]]+') FROM dual; Output: 1PSN [[:alnum:]]+ \u8868\u793a\u5339\u914d1\u4e2a\u6216\u8005\u591a\u4e2a\u5b57\u6bcd\u6216\u6570\u5b57\u5b57\u7b26 SELECT regexp_substr('1PSN/231_3253/ABc', '[[:alnum:]]+', 1, 2) FROM dual; Output: 231 \u4e0e\u4e0a\u9762\u4e00\u4e2a\u4f8b\u5b50\u76f8\u6bd4\uff0c\u591a\u4e86\u4e24\u4e2a\u53c2\u65701 \u8868\u793a\u4ece\u6e90\u5b57\u7b26\u4e32\u7684\u7b2c\u4e00\u4e2a\u5b57\u7b26\u5f00\u59cb\u67e5\u627e\u5339\u914d2 \u8868\u793a\u7b2c2\u6b21\u5339\u914d\u5230\u7684\u5b57\u7b26\u4e32\uff08\u9ed8\u8ba4\u503c\u662f\u201c1\u201d\uff0c\u5982\u4e0a\u4f8b\uff09 select regexp_substr('@@/231_3253/ABc','@*[[:alnum:]]+') from dual; Output: 231 @* \u8868\u793a\u5339\u914d0\u4e2a\u6216\u8005\u591a\u4e2a@ [[:alnum:]]+ \u8868\u793a\u5339\u914d1\u4e2a\u6216\u8005\u591a\u4e2a\u5b57\u6bcd\u6216\u6570\u5b57\u5b57\u7b26\u6ce8\u610f\uff1a\u9700\u8981\u533a\u522b\u201c+\u201d\u548c\u201c*\u201d\u7684\u533a\u522b select regexp_substr('1@/231_3253/ABc','@+[[:alnum:]]*') from dual; Output: @@+ \u8868\u793a\u5339\u914d1\u4e2a\u6216\u8005\u591a\u4e2a@ [[:alnum:]]* \u8868\u793a\u5339\u914d0\u4e2a\u6216\u8005\u591a\u4e2a\u5b57\u6bcd\u6216\u6570\u5b57\u5b57\u7b26 select regexp_substr('1@/231_3253/ABc','@+[[:alnum:]]+') from dual; Output: Null @+ \u8868\u793a\u5339\u914d1\u4e2a\u6216\u8005\u591a\u4e2a@ [[:alnum:]]+ \u8868\u793a\u5339\u914d1\u4e2a\u6216\u8005\u591a\u4e2a\u5b57\u6bcd\u6216\u6570\u5b57\u5b57\u7b26 select regexp_substr('@1PSN/231_3253/ABc125','[[:digit:]]+$') from dual; Output: 125 [[:digit:]]+$ \u8868\u793a\u5339\u914d1\u4e2a\u6216\u8005\u591a\u4e2a\u6570\u5b57\u7ed3\u5c3e\u7684\u5b57\u7b26 select regexp_substr('1@/231_3253/ABc','@+[[:alnum:]]+') from dual; Output: Null @+ \u8868\u793a\u5339\u914d1\u4e2a\u6216\u8005\u591a\u4e2a@ [[:alnum:]]+ \u8868\u793a\u5339\u914d1\u4e2a\u6216\u8005\u591a\u4e2a\u5b57\u6bcd\u6216\u6570\u5b57\u5b57\u7b26 select regexp_substr('@1PSN/231_3253/ABc125','[[:digit:]]+$') from dual; Output: 125 [[:digit:]]+$ \u8868\u793a\u5339\u914d1\u4e2a\u6216\u8005\u591a\u4e2a\u6570\u5b57\u7ed3\u5c3e\u7684\u5b57\u7b26 select regexp_substr('@1PSN/231_3253/ABc','[^[:digit:]]+$') from dual; Output: /ABc [^[:digit:]]+$ \u8868\u793a\u5339\u914d1\u4e2a\u6216\u8005\u591a\u4e2a\u4e0d\u662f\u6570\u5b57\u7ed3\u5c3e\u7684\u5b57\u7b26 select regexp_substr('[email protected]','[^@]+') from dual; Output: Tom_Kyte [^@]+ \u8868\u793a\u5339\u914d1\u4e2a\u6216\u8005\u591a\u4e2a\u4e0d\u662f\u201c@\u201d\u7684\u5b57\u7b26 select regexp_substr('1PSN/231_3253/ABc','[[:alnum:]]*',1,2) from dual; Output: Null [[:alnum:]]* \u8868\u793a\u5339\u914d0\u4e2a\u6216\u8005\u591a\u4e2a\u5b57\u6bcd\u6216\u8005\u6570\u5b57\u5b57\u7b26\u6ce8\uff1a\u56e0\u4e3a\u662f\u5339\u914d0\u4e2a\u6216\u8005\u591a\u4e2a\uff0c\u6240\u4ee5\u8fd9\u91cc\u7b2c2\u6b21\u5339\u914d\u7684\u662f\u201c/\u201d\uff08\u5339\u914d\u4e860\u6b21\uff09\uff0c\u800c\u4e0d\u662f\u201c231\u201d\uff0c\u6240\u4ee5\u7ed3\u679c\u662f\u201cNull\u201d \u8fd9\u91cc\u6211\u4eec\u6709\u65f6\u5019\u4f1a\u67e5\u8be2\u5b57\u7b26\u4e32\u91ccasdfafddafda \u8fd9\u91cc\u6211\u4eec\u8981\u53d6\u51fa\u8fd9\u4e2a\u5b57\u7b26\u4e32Select regexp_substr('asdfafddafda',']+>') from dualOutput: \u8fd9\u91cc\u6211\u4eec\u5728\u4e2d\u95f4\u53bb\u4e00\u4e2a^>\u8fd9\u6837\u5728\u5339\u914d\u4e4b\u524d\u4e0d\u518d\u5728\u6709>,\u4e0d\u7136\u7684\u8bdd\u5c31\u8981\u6709\u53ef\u4ee5\u51fa\u9519\u7684\u60c5\u51b5\u3002 Select regexp_substr('asdfafdda>fda','') from dualOutput: da>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u5728\u4e4b\u540e\u8fd8\u5728da>\uff0c\u8fd9\u6837\u7684\u8bdd\uff0c\u5982\u679c\u6211\u4eec\u6ca1\u6709\u6dfb\u52a0^>\uff0c\u6b63\u5219\u8868\u8fbe\u5f0f\u5c31\u4f1a\u5411\u540e\u7ee7\u7eed\u53bb\u5339\u914d\uff0c\u76f4\u5230\u6700\u540e\u4e00\u4e2a>\u4e3a\u81f3\uff0c\u8fd9\u6837\u5c31\u4f1a\u51fa\u73b0\u504f\u5dee \u8fd9\u4e2a\u901a\u5e38\u7528\u6765\u5b9e\u73b0\u5b57\u7b26\u4e32\u7684\u5217\u4f20\u884cselect regexp_substr('123;234;345;456;567;678;789','[^;]+',1,rownum) from dualconnect by rownum =0 and new_valueda>fda','sd') from dualOutput:2\u8fd9\u91cc\u53bb\u67e5\u8be2sd\u7684\u4f4d\u7f6e\uff0c\u8fd9\u4e2a\u548cinstr\u662f\u5728\u76f8\u540c\u7684 Select regexp_instr('asdfafdda>fda','da',1,2) from dual\u8fd9\u91cc\u662f\u67e5\u8be2da\u7b2c\u4e8c\u51fa\u73b0\u7684\u4f4d\u7f6e \u8fd8\u6709\u6211\u4eec\u7ecf\u5e38\u4f1a\u9047\u5230\u4e00\u79cd\u60c5\u51b5\u662f\uff0c\u67e5\u8be2\u67d0\u4e2a\u5b57\u6bb5\uff0c\u5982\u679c\u662f\u7b49\u4e8e\u201c\u4e0a\u6d77\u201d\u6216\u201c\u5317\u4eac\u201d\u6216\u8005\u6211\u4eec\u6e29\u5dde\u5c31\u5199\u6210\u5927\u57ce\u5e02\uff0c\u5176\u5b83\u7684\u5199\u6210\u5c0f\u57ce\u5e02\uff0c\u6211\u4eec\u4e00\u822c\u4f1a\u8003\u8651\u4f7f\u7528decode\u8fd9\u79cd\u65b9\u5f0f Select decode('\u4e0a\u6d77','\u4e0a\u6d77','\u5927\u57ce\u5e02','\u5317\u4eac' ,'\u5927\u57ce\u5e02' ,'\u6e29\u5dde' ,'\u5927\u57ce\u5e02','\u5c0f\u57ce\u5e02') from dual\u53ea\u6709\u4e24\u4e2a\u6211\u4eec\u53ef\u80fd\u89c9\u7684sql\u4e5f\u4e0d\u662f\u5f88\u5197\u957f\uff0c\u5982\u679c\u6709\u56db\u4e94\u4e2a\u7684\u8bdd\uff0c\u5c31\u6709\u70b9\u957f\u4e86\uff0c\u8fd9\u91cc\u4f7f\u7528regexp_instr\u5c31\u53ef\u4ee5\u5f88\u591a\u7684\u53bb\u64cd\u4f5c Select decode (regexp_instr('\u5317\u4eac','^(\u4e0a\u6d77|\u5317\u4eac|\u6e29\u5dde)'),0,'\u5c0f\u57ce\u5e02', '\u5927\u57ce\u5e02') from dual\u901a\u8fc7regexp_instr\u4e0d\u5339\u914d\u65f6\u4e3a0\u7684\u6761\u4ef6\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u5b8c\u6210\u4e86 \u6700\u540e\u4e00\u4e2a\u51fd\u6570regexp_replaceREGEXP_REPLACE \u51fd\u6570\u662f\u7528\u53e6\u5916\u4e00\u4e2a\u503c\u6765\u66ff\u4ee3\u4e32\u4e2d\u7684\u67d0\u4e2a\u503c\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u7528\u4e00\u4e2a\u5339\u914d\u6570\u5b57\u6765\u66ff\u4ee3\u5b57\u6bcd\u7684\u6bcf\u4e00\u6b21\u51fa\u73b0\u3002REGEXP_REPLACE\u7684\u683c\u5f0f\u5982\u4e0b\u6240\u793a \u8bed\u6cd5\uff1a 4.REGEXP_REPLACE\u4e0eREPLACE\u51fd\u6570\u76f8\u540c\uff0c\u66ff\u6362\u539f\u5b57\u7b26\u4e32\u4e2d\u7684\u5b57\u7b26\u5185\u5bb9 REGEXP_REPLACE(srcstr, pattern [,replacestr [, position [, occurrence [,match_option]]]]) \u8fd9\u4e2a\u66ff\u6362\u51fd\u6570\u8fd8\u662f\u4e00\u4e2a\u975e\u5e38\u597d\u7528\u7684\u3002\u5982\u6211\u4eec\u5728\u6709\u4e00\u4e2a\u5b57\u7b26\u4e32adfadfa (main) next \u73b0\u5728\u6211\u4eec\u8981\u628a()\u66ff\u6362\u6210\uff0c\u8fd9\u91cc\u6211\u4eec\u53ef\u80fd\u60f3\u7528replace\u5c31\u53ef\u4ee5\u641e\u5b9a\u4e86\uff0c\u4f46\u662f\u6211\u4eec\u73b0\u5728\u505a\u7684\u662f(\u4e4b\u540e\u5fc5\u987b\u6709)\u8fd9\u6837\u7684()\u6211\u4eec\u624d\u66ff\u6362\u628a.select regexp_replace('adfadfa (main) next ','(\()([^\)]*)(\))','') from dualoutput: adfadfa next\u8fd9\u91cc\u8fd8\u662f\u4e00\u4e2a\\u505a\u4e3a\u8f6c\u4e49\u5b57\u7b26\u3002 \u518d\u6765\u4e00\u4e2aip\u683c\u5f0f\u8f6c\u6362\u7684\u4f8b\u5b50\u5427\uff0c\u6211\u4eec\u4e00\u822c\u7684IP\u7684\u683c\u5f0f\u662f12.19.168.27\u73b0\u5728\u8981\u4e0d\u8db33\u4f4d\u7684\u8865\u8db3\u524d\u9762\u4e3a0\uff0c\u7ed3\u679c\u662f012.019.168.027select regexp_replace(regexp_replace('12.19.168.27','([0-9]{1,3}).([0-9]{1,3}).([0-9]{1,3}).([0-9]{1,3})','00\1.00\2.00\3.00\4') ,'([0-9]*)([0-9]{3}\.)([0-9]*)([0-9]{3}\.)([0-9]*)([0-9]{3}\.)([0-9]*)([0-9]{3}$)','\2\4\6\8')from dualoutput: 012.019.168.027\u8fd9\u91cc\u6211\u5206\u6210\u4e24\u6b65\u6765\u64cd\u4f5c\uff0cregexp_replace('12.19.168.27','([0-9]{1,3}).([0-9]{1,3}).([0-9]{1,3}).([0-9]{1,3})','00\1.00\2.00\3.00\4')\u6211\u9996\u5148\u8ba9\u6bcf\u4e2a\u5c0f\u5b57\u7b26\u4e32\u505a\u6dfb\u52a00\uff0c\u8fd9\u6837\u6bcf\u4e2a\u5b57\u7b26\u4e32\u90fd\u4f1a\u5927\u4e8e3\uff0c\u518d'([0-9]*)([0-9]{3}\.)([0-9]*)([0-9]{3}\.)([0-9]*)([0-9]{3}\.)([0-9]*)([0-9]{3}$)','\2\4\6\8')\u8fd9\u6574\u4e2a\u5b57\u7b26\u4e32\u5206\u62108\u6bb5\uff0c\u8fd9\u6837\u6211\u4eec\u53ea\u89812\u30014\u30016\u30018\u8fd9\u56db\u4e2a\u6bb5\u5c31\u53ef\u4ee5\u4e86\u3002 \u4e0b\u9762\u4e00\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u5728\u6bcf\u4e24\u4e2a\u5b57\u7b26\u4e4b\u95f4\u63d2\u5165\u4e00\u4e2a\u7a7a\u683c\u7b26SELECT regexp_replace('YAHOO', '(.)', '\1 ') AS output FROM dual; Output: Y A H O O\u8fd9\u4e2a\u7528\u4e00\u4e2a\u5faa\u73af\u7684\u65b9\u5f0f\u53bb\u64cd\u4f5c\uff0c\u8fd8\u86ee\u5f88\u597d\u7684\u3002 select regexp_replace(regexp_replace('12.19.168.27','([^.]+)','00\1') ,'([^.]*)([^.]{3})','\2')from dual\u63a5\u7740\u521a\u624d\u90a3\u4e2a\uff0c\u6211\u4eec\u53ef\u4ee5\u628areplace\u5faa\u73af\u66ff\u6362\u7684\u65b9\u5f0f\u6765\u64cd\u4f5c\u3002

Oracle使用正则表达式离不开这4个函数：

1、regexp_like

2、regexp_substr

3、regexp_instr

4、regexp_replace

regexp_like 只能用于条件表达式，和 like 类似，但是使用的正则表达式进行匹配，语法如下：

regexp_substr 函数，和 substr 类似，用于拾取合符正则表达式描述的字符子串，语法如下：

regexp_instr 函数，和 instr 类似，用于标定符合正则表达式的字符子串的开始位置，语法如下：

regexp_replace 函数，和 replace 类似，用于替换符合正则表达式的字符串，语法如下：

解析一下几个参数的含义：

1、source_char，输入的字符串，可以是列名或者字符串常量、变量。

2、pattern，正则表达式。

3、match_parameter，匹配选项。

取值范围： i：大小写不敏感； c：大小写敏感；n：点号 . 不匹配换行符号；m：多行模式；x：扩展模式，忽略正则表达式中的空白字符。

4、position，标识从第几个字符开始正则表达式匹配。

5、occurrence，标识第几个匹配组。

6、replace_string，替换的字符串。

扩展阅读：100种常用正则表达式 ... 正则表达式在线生成器 ... 20个常用的正则表达式 ... sql带负号的正则表达式 ... 正则表达式匹配查询 ... 正则表达式规则sql ... python正则表达式 ... excel正则表达式 查找 ... oracle正则表达式匹配数字 ...