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Oracle PL/SQL/Regular Expressions/Word Start End - История изменений
2026-04-04T10:08:19Z
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в 13:45, 26 мая 2010
2010-05-26T13:45:19Z
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Admin: 1 версия
2010-05-26T10:02:08Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>==Add anchors or "wildcard" match characters as need be==<br />
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<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL><br />
SQL> -- Add anchors or "wildcard" match characters as need be.<br />
SQL><br />
SQL> SELECT REGEXP_INSTR("Hello","^.",2) FROM dual;<br />
REGEXP_INSTR("HELLO","^.",2)<br />
----------------------------<br />
0<br />
SQL><br />
<br />
</source><br />
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=="$" a dollar sign is another anchoring operator and matches only the end of a string==<br />
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<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL> create table TestTable(<br />
2 ID VARCHAR2(4 BYTE) NOT NULL,<br />
3 Description VARCHAR2(40 BYTE)<br />
4 )<br />
5 /<br />
Table created.<br />
SQL><br />
SQL><br />
SQL> insert into TestTable (ID, Description) values("1","1234 5th Street");<br />
1 row created.<br />
SQL> insert into TestTable (ID, Description) values("2","1 Culloden Street");<br />
1 row created.<br />
SQL> insert into TestTable (ID, Description) values("3","1234 Road");<br />
1 row created.<br />
SQL> insert into TestTable (ID, Description) values("4","33 Thrid Road");<br />
1 row created.<br />
SQL> insert into TestTable (ID, Description) values("5","One than another");<br />
1 row created.<br />
SQL> insert into TestTable (ID, Description) values("6","2003 Movie showing");<br />
1 row created.<br />
SQL> insert into TestTable (ID, Description) values("7","Start With Letters");<br />
1 row created.<br />
SQL><br />
SQL> select * from TestTable;<br />
ID DESCRIPTION<br />
---- ----------------------------------------<br />
1 1234 5th Street<br />
2 1 Culloden Street<br />
3 1234 Road<br />
4 33 Thrid Road<br />
5 One than another<br />
6 2003 Movie showing<br />
7 Start With Letters<br />
7 rows selected.<br />
SQL><br />
SQL><br />
SQL><br />
SQL><br />
SQL><br />
SQL> -- "$" a dollar sign is another anchoring operator and matches only the end of a string.<br />
SQL><br />
SQL> SELECT description, REGEXP_INSTR(description,"ing$") where_it_is<br />
2 FROM testTable<br />
3 WHERE REGEXP_INSTR(description,"ing$") > 0;<br />
DESCRIPTION WHERE_IT_IS<br />
---------------------------------------- -----------<br />
2003 Movie showing 16<br />
SQL><br />
SQL><br />
SQL> drop table TestTable;<br />
Table dropped.<br />
SQL><br />
SQL><br />
<br />
</source><br />
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<br />
<br />
=="^" "anchoring operator" and matches the beginning of a string==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL> create table TestTable(<br />
2 ID VARCHAR2(4 BYTE) NOT NULL,<br />
3 Description VARCHAR2(40 BYTE)<br />
4 )<br />
5 /<br />
Table created.<br />
SQL><br />
SQL><br />
SQL> insert into TestTable (ID, Description) values("1","1234 5th Street");<br />
1 row created.<br />
SQL> insert into TestTable (ID, Description) values("2","1 Culloden Street");<br />
1 row created.<br />
SQL> insert into TestTable (ID, Description) values("3","1234 Road");<br />
1 row created.<br />
SQL> insert into TestTable (ID, Description) values("4","33 Thrid Road");<br />
1 row created.<br />
SQL> insert into TestTable (ID, Description) values("5","One than another");<br />
1 row created.<br />
SQL> insert into TestTable (ID, Description) values("6","2003 Movie");<br />
1 row created.<br />
SQL> insert into TestTable (ID, Description) values("7","Start With Letters");<br />
1 row created.<br />
SQL><br />
SQL> select * from TestTable;<br />
ID DESCRIPTION<br />
---- ----------------------------------------<br />
1 1234 5th Street<br />
2 1 Culloden Street<br />
3 1234 Road<br />
4 33 Thrid Road<br />
5 One than another<br />
6 2003 Movie<br />
7 Start With Letters<br />
7 rows selected.<br />
SQL><br />
SQL><br />
SQL> --"^" "anchoring operator" and matches the beginning of a string. <br />
--The caret may also mean "not,".<br />
SQL><br />
SQL> SELECT description, REGEXP_INSTR(description,"^O.e") where_it_is<br />
2 FROM testTable<br />
3 WHERE REGEXP_INSTR(description,"^O.e") > 0;<br />
DESCRIPTION WHERE_IT_IS<br />
---------------------------------------- -----------<br />
One than another 1<br />
SQL><br />
SQL><br />
SQL><br />
SQL><br />
SQL><br />
SQL> drop table TestTable;<br />
Table dropped.<br />
SQL><br />
SQL><br />
<br />
</source><br />
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<br />
<br />
==Asking for a match for a capital "F" followed by any character==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL> create table TestTable(<br />
2 ID VARCHAR2(4 BYTE) NOT NULL,<br />
3 Description VARCHAR2(40 BYTE)<br />
4 )<br />
5 /<br />
Table created.<br />
SQL><br />
SQL><br />
SQL> insert into TestTable (ID, Description) values("1","1234 5th Street");<br />
1 row created.<br />
SQL> insert into TestTable (ID, Description) values("2","1 Culloden Street");<br />
1 row created.<br />
SQL> insert into TestTable (ID, Description) values("3","1234 Road");<br />
1 row created.<br />
SQL> insert into TestTable (ID, Description) values("4","33 Thrid Road");<br />
1 row created.<br />
SQL> insert into TestTable (ID, Description) values("5","One than another");<br />
1 row created.<br />
SQL> insert into TestTable (ID, Description) values("6","F003 Movie");<br />
1 row created.<br />
SQL> insert into TestTable (ID, Description) values("7","Start With Letters");<br />
1 row created.<br />
SQL><br />
SQL> select * from TestTable;<br />
ID DESCRIPTION<br />
---- ----------------------------------------<br />
1 1234 5th Street<br />
2 1 Culloden Street<br />
3 1234 Road<br />
4 33 Thrid Road<br />
5 One than another<br />
6 F003 Movie<br />
7 Start With Letters<br />
7 rows selected.<br />
SQL><br />
SQL><br />
SQL><br />
SQL> -- Asking for a match for a capital "F" followed by any character<br />
SQL><br />
SQL> SELECT description, REGEXP_INSTR(description,"^F.") where_it_is<br />
2 FROM testTable<br />
3 WHERE REGEXP_INSTR(description,"^F.") > 0;<br />
DESCRIPTION WHERE_IT_IS<br />
---------------------------------------- -----------<br />
F003 Movie 1<br />
SQL><br />
SQL><br />
SQL><br />
SQL><br />
SQL><br />
SQL> drop table TestTable;<br />
Table dropped.<br />
SQL><br />
SQL><br />
<br />
</source></div>
Admin