Tomcat配置文件server.xml中常用元素简介

1)REGEXP example01

1@@@@a glance of REGEXP

@@@

@@@<1>'*the*' => vague search all line.

@@@

[oracle@station78 ~]$ sqlplus / as sysdba;

SYS@ocp> CREATE TABLE t_regexp (chardata varchar2(50));

Table created.

SYS@ocp> INSERT INTO t_regexp VALUES('A theory concerning');

1 row created.

SYS@ocp> INSERT INTO t_regexp VALUES('the origin of the universe, is the Big');

1 row created.

SYS@ocp> INSERT INTO t_regexp VALUES('Bang.');

1 row created.

SYS@ocp> commit;

Commit complete.

@@@

@@@usage: regexp_like(column_name, condition)

SYS@ocp> SELECT * FROM t_regexp WHERE REGEXP_LIKE(chardata,'*the*');

CHARDATA

------------------------------------------------------------------

A theory concerning

the origin of the universe, is the Big

@@@

@@@<2>'^the' => the start of line.

@@@

regexp_like(search_string, pattern_string, match_parameter)

match_parameter:

'i' case-insensitive matching

'c' case-insensitive matching

'm' allows the period '.' to match the new line character

'n' allows the search_string to represent or contain multiple lines

@@@search the 'the' occurs only at the start of line.

SYS@ocp> SELECT * FROM t_regexp WHERE REGEXP_LIKE(chardata,'^the*');

CHARDATA

--------------------------------------------------

the origin of the universe, is the Big

@@@

@@@<3>[Yy] {1}B.{1}g single character.

@@@

Note:

combine the use of the '.' to match any single character with '{}' repetition

catability, here I find a single character between 'B' and 'g' and exactly two

characters between the 'B' and 'g'.

using [abcd] match an any single characters.

SYS@ocp> SELECT * FROM t_regexp WHERE REGEXP_LIKE(chardata,'B.g');

CHARDATA

------------------------------------------------------------------------------

the origin of the universe, is the Big

SYS@ocp> SELECT * FROM t_regexp WHERE REGEXP_LIKE(chardata,'B.{1}g');

CHARDATA

-------------------------------------------------------------------------------

the origin of the universe, is the Big

SYS@ocp> SELECT * FROM t_regexp WHERE REGEXP_LIKE(chardata,'B.{2}g');

CHARDATA

--------------------------------------------------------------------------------

Bang.

SYS@ocp> SELECT * FROM t_regexp WHERE REGEXP_LIKE(chardata,'[abcd]');

CHARDATA

----------------------------------------------------------------------------------------------------

A theory concerning

Bang.

@@@

@@@<4>regexp_instr(), regexp_substr()

@@@

SYS@ocp> SELECT regexp_instr(chardata,'B.{1}g')

2> FROM t_regexp

3> WHERE regexp_like(chardata,'B.{1}g');

REGEXP_INSTR(CHARDATA,'B.{1}G')

-------------------------------

36

SYS@ocp> SELECT regexp_instr(chardata,'B.{1}g') FROM t_regexp;

REGEXP_INSTR(CHARDATA,'B.{1}G')

-------------------------------

0

36

0

SYS@ocp> SELECT regexp_substr(chardata,'B.{2}g')

2> FROM t_regexp

3> WHERE regexp_like(chardata,'B.{2}g');

REGEXP_SUBSTR(CHARDATA,'B.{2}G')

--------------------------------------------------------------------------------------

Bang

@@@

@@@<5>regexp_replace()

@@@

SYS@ocp> INSERT INTO t_regexp VALUES('123-456-7890');

1 row created.

SYS@ocp> INSERT INTO t_regexp VALUES('(111)-222-3333');

1 row created.

SYS@ocp> INSERT INTO t_regexp VALUES('333-444-5555');

1 row created.

SYS@ocp> commit;

Commit complete.

SYS@ocp> ed

1 SELECT regexp_replace(chardata,

2 '(\()(.*)(\))-(.*)-(.*)',

3 '\2-\4-5')

4 AS transformed_string

5* FROM t_regexp

SYS@ocp> /

TRANSFORMED_STRING

----------------------------------------------------------------------------------------------------

A theory concerning

the origin of the universe, is the Big

Bang.

123-456-7890

111-222-5

333-444-5555

6 rows selected.

@@@

@@@<6>continue...

@@@

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