Oracle regular expressions REGEXP_SUBSTR

Hi,
I'm relatively new here and this is might be a kind of silly.
Start using reg expressiona and do not know how to get the second pattern from the end (7 in this case)?
select REGEXP_SUBSTR('1/2/3/4/5/6/7/8' ,'[^/]+$',1, 1),
REGEXP_SUBSTR('1/2/3/4/5/6/7/8' ,'[^/]+$',1, 2),
REGEXP_SUBSTR('1/2/3/4/5/6/7/8' ,'[^/]+$')
from dual;
Please help.
Edited by: lsy_nn on Jul 21, 2010 1:51 PM

RegExp_Replace is useful ;-)
Let us read these threads.
I have created part4 :8}
Introduction to regular expressions part1 to part4
Introduction to regular expressions ...
Introduction to regular expressions ... continued.
Introduction to regular expressions ... last part.
Introduction to regular expressions part4
col extStr for a10
select
RegExp_Replace('1/2/3/4/5/6/7/8',
'^.*([^/]+)/.*$',
'\1') as extStr
from dual;
EXTSTR
7

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Hi All,
I have regular expression problem.
create table url ( Url varchar2(1024));
insert into URL values ('http://abc.jambo.com/ababs/sffef/dsf/sdfdsf/jk.htm')
insert into URL values ('.*amazon.com.*');
insert into URL values ('Abc.com');
insert into URL values ('xyz.Abc.com');
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But it returns following result
URL                                                                       REGEXP_SUBSTR
http://abc.jambo.com/ababs/sffef/dsf/sdfdsf/jk.htm         http://abc.jambo.com/
.**abc.amazon.com.**                                                 NULL
Abc.com                                                                 NULL
xyz.Abc.com                                                         NULL
.**amazon.com.**                                                         NULL
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*URL                                                                       REGEXP_SUBSTR*
http://abc.jambo.com/ababs/sffef/dsf/sdfdsf/jk.htm         abc.jambo.com
.**abc.amazon.com.**                                                 abc.amazon.com
Abc.com                                                                 Abc.com
xyz.Abc.com                                                         xyz.Abc.com
.**amazon.com.**                                                         amazon.com
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Edited by: Kuldeep2 on Apr 28, 2009 3:56 AM
Edited by: Kuldeep2 on Apr 29, 2009 3:28 AM

SQL> select url, regexp_substr(url,'[[:alnum:]|\.]*com')new_url from url
2 /
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.*amazon.com.*                                     amazon.com
Abc.com                                            Abc.com
xyz.Abc.com                                        xyz.Abc.com
^http://bhido.jambo.com/ababs/kd.htm               bhido.jambo.com

Oracle regular expression help

I have worked with regular expressions a little bit in unix scripting.
I need to diff two schemas to look for missing objects.
Problem: I changed the naming conventions.
My objects used to end with '_T' and now end with '_MV'
I cant use regular instr because I can have
HELLO_TYPES_T or I could have HELLO_T
I want to trim off the last T and MV and then do a minus to see if I am missing objects.
I I think I need to use regexp_instr with an end of line regular expression, but I can't get the syntax correct. Can someone give me a hand?

Well, how about this:
SQL> with schema1
2   as ( select 'HELLO_TYPES_T' obj from dual union all
3        select 'HELLO_T' from dual union all
4        select 'TYPES_T' obj from dual union all
5        select 'HELLO_TYPES_MV' obj from dual union all
6        select 'HELLO_MV' from dual union all
7        select 'TYPES_MV' obj from dual union all
8        select 'OBJECTS_T' obj from dual )
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12        select 'TYPES_T' obj from dual union all
13        select 'HELLO_TYPES_MV' obj from dual union all
14        select 'HELLO_MV' from dual union all
15        select 'TYPES_MV' obj from dual)
         ---actual query
16    select regexp_replace(obj, '^*(_T|_MV)$', '') regexp
17    from   schema1
18    minus
19    select regexp_replace(obj, '^*(_T|_MV)$', '') regexp
20    from   schema2;
REGEXP
OBJECTS
1 row selected.And vice versa (schema2 minus schema1)

Need PL/SQL - Oracle Regular Expressions help

Hi all,
I have to create script some schema in oracle database to update our SVN. And after create DDL scrip need to do some modification (Ex: add columns). Example as follows,
After create table DDL original scripts as follows,
--table format 1
CREATE TABLE "USER"."TABLE1"
        "COLUMN1"   NUMBER,
        "COLUMN2"   NUMBER,
        "COLUMN3"   NUMBER,
        "COLUMN4"   VARCHAR2(20 BYTE),
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        INITIAL 35651584 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT
    TABLESPACE "T1" ;
CREATE INDEX "USER"."TABLE1_COLUMN2" ON "USER"."TABLE1"
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        INITIAL 196608 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT
    TABLESPACE "T1" ;
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        INITIAL 458752 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT
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        "COLUMN3" NUMBER,
        "COLUMN4" VARCHAR2(20 BYTE)
    PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING STORAGE
        INITIAL 35651584 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT
    TABLESPACE "T1" ;
CREATE INDEX "USER"."TABLE2_COLUMN1" ON "USER"."TABLE2"
        "COLUMN1"
    PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE
        INITIAL 196608 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT
    TABLESPACE "T1" ;
CREATE INDEX "USER"."TABLE2_COLUMN2" ON "SPIDERP4"."TABLE2"
        "COLUMN2"
    PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE
        INITIAL 458752 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT
    TABLESPACE "T1" ;
I need to include following amendment to above table scripts (expecting results),
--1
CREATE TABLE "USER"."TABLE1"
        "COLUMN1"   NUMBER,
        "COLUMN2"   NUMBER,
        "COLUMN3"   NUMBER,
        "COLUMN4"   VARCHAR2(20 BYTE),
        _*"COLUMN5"   NUMBER(3,0) DEFAULT 0,*_
        PRIMARY KEY ("COLUMN1") USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT) TABLESPACE "T1" ENABLE
    PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING STORAGE
        INITIAL 35651584 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT
    TABLESPACE "T1" ;
CREATE INDEX "USER"."TABLE1_COLUMN2" ON "USER"."TABLE1"
        "COLUMN2"
    PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE
        INITIAL 196608 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT
    TABLESPACE "T1" ;
CREATE INDEX "USER"."TABLE1_COLUMN3" ON "SPIDERP4"."TABLE1"
        "COLUMN3"
    PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE
        INITIAL 458752 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT
    TABLESPACE "T1" ;
--2
CREATE TABLE "USER"."TABLE2"
        "COLUMN1" NUMBER,
        "COLUMN2" NUMBER,
        "COLUMN3" NUMBER,
        "COLUMN4" VARCHAR2(20 BYTE),
        _*"COLUMN5" NUMBER(3,0) DEFAULT 0*_
    PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING STORAGE
        INITIAL 35651584 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT
    TABLESPACE "T1" ;
CREATE INDEX "USER"."TABLE2_COLUMN1" ON "USER"."TABLE2"
        "COLUMN1"
    PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE
        INITIAL 196608 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT
    TABLESPACE "T1" ;
CREATE INDEX "USER"."TABLE2_COLUMN2" ON "SPIDERP4"."TABLE2"
        "COLUMN2"
    PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE
        INITIAL 458752 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT
    TABLESPACE "T1" ;
/Note:
I need solution apart from these conditions,
1)Table cannot be modify before create DDL (DDL creating using this method “dbms_metadata.get_ddl” ).
2)This is automated processes manual modification cannot be allow.
3)We cannot hard-coded any Dynamic Values because above create DDL table just for explain my question.(**note : “PCTFREE” ,” PRIMARY KEY”, “),”.... above values can be hard-coded**)
Thanks
Tharindu Dhaneenja
Edited by: Dhaneenja on Mar 14, 2011 11:16 PM
Edited by: Dhaneenja on Mar 14, 2011 11:17 PM
Edited by: BluShadow on 15-Mar-2011 09:08
Added {noformat}{noformat} tags

not very safe code to do what you are looking for...
=================test data========================
SET ECHO ON FEED OFF LIN 2000 PAGES 9999 LONG 1000000 LONGC 1000 TRIMS ON;
EXEC DBMS_METADATA.SET_TRANSFORM_PARAM( DBMS_METADATA.SESSION_TRANSFORM,'SQLTERMINATOR',TRUE);
DROP USER u CASCADE;
GRANT DBA TO u IDENTIFIED BY u;
CREATE TABLE u.t1
   c1   NUMBER,
   c2   NUMBER,
   c3   NUMBER,
   c4   NUMBER,
   PRIMARY KEY (c1)
CREATE TABLE u.t2
   c1   NUMBER,
   c2   NUMBER,
   c3   NUMBER,
   c4   NUMBER
CREATE TABLE u.t3
   c1   NUMBER NOT NULL,
   c2   NUMBER,
   c3   NUMBER
CREATE TABLE u.t4 (c1 NUMBER    REFERENCES u.t1);
CREATE TABLE u.t5 (c1 NUMBER UNIQUE);
CREATE TABLE u.t6 (c1 NUMBER CHECK (c1 > 0));
CREATE TABLE u.t7 (c1 NUMBER NOT NULL);=================query========================
SELECT CASE
          WHEN (SELECT COUNT (*)
                  FROM dba_tab_columns tc
                 WHERE tc.owner = o.owner AND tc.table_name = o.object_name) >
                  0
          THEN
             SUBSTR (
                DBMS_METADATA.get_ddl (object_type, object_name, owner),
                1,
                INSTR (
                   DBMS_METADATA.get_ddl (object_type, object_name, owner),
                   CHR (10),
                   1,
                   2
                   + (SELECT COUNT (*)
                        FROM dba_tab_columns tc
                       WHERE tc.owner = o.owner
                             AND tc.table_name = o.object_name)))
             || CASE
                   WHEN (SELECT COUNT (*)
                           FROM sys.obj$ so,
                                sys.cdef$ scd,
                                sys.con$ sc,
                                sys.user$ su
                          WHERE     su.user# = so.owner#
                                AND so.obj# = scd.obj#
                                AND scd.con# = sc.con#
                                AND so.obj# = scd.obj#
                                AND scd.type# != 7
                                AND so.name = o.object_name
                                AND su.name = o.owner) = 0
                   THEN
                      ',column5 number(3,0) default 0'
                   ELSE
                      'column5 number(3,0) default 0,'
                END
             || SUBSTR (
                   DBMS_METADATA.get_ddl (object_type, object_name, owner),
                   INSTR (
                      DBMS_METADATA.get_ddl (object_type, object_name, owner),
                      CHR (10),
                      1,
                      2
                      + (SELECT COUNT (*)
                           FROM dba_tab_columns tc
                          WHERE tc.owner = o.owner
                                AND tc.table_name = o.object_name)))
          ELSE
             DBMS_METADATA.get_ddl (object_type, object_name, owner)
       END
          t
FROM dba_objects o
WHERE owner = 'U';=================output========================
CREATE TABLE "U"."T1"
   (    "C1" NUMBER,
        "C2" NUMBER,
        "C3" NUMBER,
        "C4" NUMBER,
column5 number(3,0) default 0,
         PRIMARY KEY ("C1")
USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255
TABLESPACE "USERS" ENABLE
   ) SEGMENT CREATION DEFERRED
PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
TABLESPACE "USERS" ;
CREATE UNIQUE INDEX "U"."SYS_C0025504" ON "U"."T1" ("C1")
PCTFREE 10 INITRANS 2 MAXTRANS 255
TABLESPACE "USERS" ;
CREATE TABLE "U"."T3"
   (    "C1" NUMBER NOT NULL ENABLE,
        "C2" NUMBER,
        "C3" NUMBER
,column5 number(3,0) default 0
   ) SEGMENT CREATION DEFERRED
PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
TABLESPACE "USERS" ;
CREATE TABLE "U"."T4"
   (    "C1" NUMBER,
column5 number(3,0) default 0,
         FOREIGN KEY ("C1")
          REFERENCES "U"."T1" ("C1") ENABLE
   ) SEGMENT CREATION DEFERRED
PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
TABLESPACE "USERS" ;
CREATE TABLE "U"."T2"
   (    "C1" NUMBER,
        "C2" NUMBER,
        "C3" NUMBER,
        "C4" NUMBER
,column5 number(3,0) default 0
   ) SEGMENT CREATION DEFERRED
PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
TABLESPACE "USERS" ;
CREATE TABLE "U"."T5"
   (    "C1" NUMBER,
column5 number(3,0) default 0,
         UNIQUE ("C1")
USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255
TABLESPACE "USERS" ENABLE
   ) SEGMENT CREATION DEFERRED
PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
TABLESPACE "USERS" ;
CREATE UNIQUE INDEX "U"."SYS_C0025507" ON "U"."T5" ("C1")
PCTFREE 10 INITRANS 2 MAXTRANS 255
TABLESPACE "USERS" ;
CREATE TABLE "U"."T6"
   (    "C1" NUMBER,
column5 number(3,0) default 0,
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   ) SEGMENT CREATION DEFERRED
PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
TABLESPACE "USERS" ;
CREATE TABLE "U"."T7"
   (    "C1" NUMBER NOT NULL ENABLE
,column5 number(3,0) default 0
   ) SEGMENT CREATION DEFERRED
PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
TABLESPACE "USERS" ;

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SSU wrote:
Hello Everyone,
I am trying to write a function by using oracles regular expression function REGEXP_REPLACE but I could not succed till now.
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Hi All,
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884476 wrote:
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Dot (.) means any character. Asterisk (*) means repeated 0 or more times. This is our part A (I'll get back to ? later). Pipe (|) means OR. Dollar sigh ($) means end-of-line. Parenthesis mean grouping. So ((oracle)|$) means string oracle or end-of line. This is our part B. Now back to question mark. By default Oracle regular expressions are "greedy". We say any character repeated any number of times followed by word oracle. Since word oracle itself matched definition of any character repeated any number of times (6 in this case) regexp will match it that way that it will be from the beginning of the string to last occurrence of word oracle - that's why it is called "greedy". Question mark (?) tells regexp not to use greedy matching, therefore '.*?oracle' will stop at first occurrence of word oracle. Now replacement string. Notation \1 is grouping backreference. Group 1 is ((oracle)|$) and, as I already noted, means string oracle or end-of line (whichever was found).
SY.

Regular Expressions in Oracle

Hello All,
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Edited by: Parag Kalra on Dec 19, 2009 11:03 AM

Hi, Parag,
Look under [R in the index of the SQL language manual|http://download.oracle.com/docs/cd/B28359_01/server.111/b28286/index.htm#R]. All the regular expression functions and operators start with "REGEXP", and there are a couple of entries under "regular expressions".
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Regular expressions in Oracle 9i

Hello,
Does oracle 9i support regular expressions?
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Roger22 wrote:
Hello,
Does oracle 9i support regular expressions?
I need to check if a varchar parameter contains only numbers OR letters, otherwise i should return false.
Thanks.TRANSLATE is helpful to do such a check.
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WITH testdata AS
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abcdef           abcdef
1234567             1234567
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123a4567x00     ax     123456700
123.4567,00     .,     123.4567,00One idea is to check the result for NULL or to compare the length of similiar expressions.
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Edited by: Sven W. on Aug 11, 2010 11:07 AM
Edited by: Sven W. on Aug 11, 2010 11:07 AM

Regular expressions in oracle 10 g

how to use regular expressions in oracle 10g forms

May be forms related question better answered in forms forum.
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Hi,
I want to match a word "{color:#993300}83-ASG{color}" using regexp_like and i used '{color:#993300}^83-*{color}' pattern to match this word but this also matches words like "{color:#993300}8307-YUF{color}". could anyone please tell me what pattern should i use to match words like {color:#993300}83-ASG{color}.
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Hi Prasad,
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Hi!
I am trying the regular expression SQL functions of 10g to Oracle 7.3 and it seems the older version does not cover this feature yet.
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Hi,
Welcome to the forum!
kitsune wrote:
Hi!
I am trying the regular expression SQL functions of 10g to Oracle 7.3 and it seems the older version does not cover this feature yet.You're right; regular expressions only work in Oracle 10.1 and higher.
>
>
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The string pattern is to look for comma-punctuations that is not followed immediately by whitespacess so I can replace this with a comma followed by a whitespace.
Any workaround for this?You're best bet in Oracle 7.3 would be a user-defined function. That's a very old version; don't expect much.
Do you know anything else about the string? For example, is there some character (say ~) that never occurs in the string? Will there ever be two (or more) whitespace characters after punctuation? What characters do you consider to be whitespace? Which are punctuation? Depending on the answers, you might be able to do something with nested REPLACE and/or TRANSLATE functions.

Regular expression vs oracle text performance

Does anyone have experience with comparig performance of regular expression vs oracle text?
We need to implement a text search on a large volume table, 100K-500K rows.
The select stmt will select from a VL, a view joining 2 tables, B and _TL.
We need to search 2 text columns from this _VL view.
Using regex seems less complex, but the deciding factor is of course performace.
Would oracle text search perform better than regular expression in general?
Thanks,
Margaret

Hi Dominc,
Thanks, we'll try both...
Would you be able to validate our code to create the multi-table index:
CREATE OR REPLACE PACKAGE requirements_util AS
PROCEDURE concat_columns(i_rowid IN ROWID, io_text IN OUT NOCOPY VARCHAR2);
END requirements_util;
CREATE OR REPLACE PACKAGE BODY requirements_util AS
PROCEDURE concat_columns(i_rowid IN ROWID, io_text IN OUT NOCOPY VARCHAR2)
AS
tl_req pjt_requirements_tl%ROWTYPE;
b_req pjt_requirements_b%ROWTYPE;
CURSOR cur_req_name (i_rqmt_id IN pjt_requirements_tl.rqmt_id%TYPE) IS
SELECT rqmt_name FROM pjt_requirements_tl
WHERE rqmt_id = i_rqmt_id;
PROCEDURE add_piece(i_add_str IN VARCHAR2) IS
lx_too_big EXCEPTION;
PRAGMA EXCEPTION_INIT(lx_too_big, -6502);
BEGIN
io_text := io_text||' '||i_add_str;
EXCEPTION WHEN lx_too_big THEN NULL; -- silently don't add the string.
END add_piece;
BEGIN
     BEGIN
          SELECT * INTO b_req FROM pjt_requirements_b WHERE ROWID = i_rowid;
          EXCEPTION
          WHEN NO DATA_FOUND THEN
          RETURN;
     END;
     add_piece(b_req.req_code);
     FOR tl_req IN cur_req_name(b_req.rqmt_id) LOOP
     add_piece(tl_req.rqmt_name);
END concat_columns;
END requirements_util;
EXEC ctx_ddl.drop_section_group('rqmt_sectioner');
EXEC ctx_ddl.drop_preference('rqmt_user_ds');
BEGIN
ctx_ddl.create_preference('rqmt_user_ds', 'USER_DATASTORE');
ctx_ddl.set_attribute('rqmt_user_ds', 'procedure', sys_context('userenv','current_schema')||'.'||'requirements_util.concat_columns');
ctx_ddl.set_attribute('rqmt_user_ds', 'output_type', 'VARCHAR2');
END;
CREATE INDEX rqmt_cidx ON pjt_requirements_b(req_code)
INDEXTYPE IS CTXSYS.CONTEXT
PARAMETERS ('DATASTORE rqmt_user_ds
SYNC (ON COMMIT)');

Oracle regular expressions REGEXP_SUBSTR

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