Stripping all HTML tags from a CLOB

Hi all,
Running Oracle 9.2.0.8 on AIX...
We have a table which stores HTML document fragments in a clob. I have a requirement to convert these to plain/text (strip all HTML tags) for sending in a plain/text email body.
I have read the following solution from Tom Kyte's site:
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:25695084847068
Basically creating an Oracle text index on the CLOB column and calling ctx_doc.filter with "plaintext" parameter set to true.
I noticed in Tom's example, he uses the default filter, which based on the docs, is NULL_FILTER, which applies no filtering. I have tried his example in my dev box, creating the text index on the CLOB column with no parameters.
The call to ctx_doc.filter did not filter the html at all. I re-created the index and specified the INSO_FILTER and the filtering was done. I was under the impression that INSO_FILTER was for filtering binary content to plaintext...
create table filter ( query_id number, document clob );
create table demo
( id int primary key,
 theclob clob
create index demo_idx on demo(theClob) indextype is ctxsys.context;
SET DEFINE OFF;
Insert into DEMO
 (ID, THECLOB)
Values
 (1, '<html><body>This is a test of ctx_doc.filter and plaintext filtering.</body></html>');
COMMIT;
exec ctx_doc.filter('demo_idx',1, 'filter',1, true);The above code does not convert the html to plaintext...
Now re-create with the index with INSO_FILTER
drop index demo_idx;
create index demo_idx on demo(theClob) indextype is ctxsys.context parameters ('filter ctxsys.inso_filter');
exec ctx_doc.filter('demo_idx',1, 'filter',1, true);Above scenario returns string "This is a test of ctx_doc.filter and plaintext filtering."
The ORacle documentation doesn't specify any special filter parameter that needs to be set... just wondering if I'm missing soemthing here... or better yet, if there is a better solution to my problem. ;-)
Thanks
Stephane

The difference between what you did and what Tom Kyte did is that you created your index on a clob column and Tom created his index on a blob column. What I don't know is why that makes a difference. I have demonstrated below with one blob column and one clob column, one index on the blob and one index on the clob, using the same code on both, with different results.
SCOTT@orcl_11gR2> create table filter
2 (query_id number,
3 document clob)
4 /
Table created.
SCOTT@orcl_11gR2> create table demo
2 (id int primary key,
3 theblob blob,
4 theclob clob)
5 /
Table created.
SCOTT@orcl_11gR2> create index demo_blob_idx
2 on demo (theblob)
3 indextype is ctxsys.context
4 /
Index created.
SCOTT@orcl_11gR2> create index demo_clob_idx
2 on demo (theclob)
3 indextype is ctxsys.context
4 /
Index created.
SCOTT@orcl_11gR2> insert into demo values
2 (1,
3 utl_raw.cast_to_raw (
4 '<html>
5 <body>
6 
7 This is a test of
8 ctx_doc.filter 
9 and plaintext filtering.
10 
11 </body>
12 </html>'),
13 '<html>
14 <body>
15 
16 This is a test of
17 ctx_doc.filter 
18 and plaintext filtering.
19 
20 </body>
21 </html>')
22 /
1 row created.
SCOTT@orcl_11gR2> exec ctx_doc.filter ('demo_blob_idx', 1, 'filter', 1, true)
PL/SQL procedure successfully completed.
SCOTT@orcl_11gR2> exec ctx_doc.filter ('demo_clob_idx', 1, 'filter', 2, true)
PL/SQL procedure successfully completed.
SCOTT@orcl_11gR2> select id, utl_raw.cast_to_varchar2 (theblob), theclob from demo
2 /
 ID
UTL_RAW.CAST_TO_VARCHAR2(THEBLOB)
THECLOB
 1
<html>
 <body>
 
 This is a test of
 ctx_doc.filter 
 and plaintext filtering.
 
 </body>
 </html>
<html>
 <body>
 
 This is a test of
 ctx_doc.filter 
 and plaintext filtering.
 
 </body>
 </html>
1 row selected.
SCOTT@orcl_11gR2> select query_id, document from filter
2 /
QUERY_ID
DOCUMENT
 1
This is a test of ctx_doc.filter and plaintext filtering.
 2
<html>
 <body>
 
 This is a test of
 ctx_doc.filter 
 and plaintext filtering.
 
 </body>
 </html>
2 rows selected.
SCOTT@orcl_11gR2>

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Doing various tests I found out that the problem is when I need to search in multiple columns of a table.
That is when I create a user_datastore that uses a procedure that concatenates the columns.
And especially when the data with the html tags is in a VARCHAR2 column.
e.g
--create the table*
CREATE TABLE CONTENT_TRANS (content_trans_id NUMBER,
main_text CLOB,
title vARCHAR2(2000),
oracle_text_column VARCHAR2(1));
alter table "CONTENT_TRANS" add constraint CONTENT_PK primary key("CONTENT_TRANS_ID") ;
--Insert dummy data*
Insert into CONTENT_TRANS
(CONTENT_TRANS_ID,MAIN_TEXT,TITLE)
values
(1,'lorem','lorem qualification 2.1 ');
Insert into CONTENT_TRANS
(CONTENT_TRANS_ID,MAIN_TEXT,TITLE)
values
(2,'lorem','lorem qualification 2.1 ');
--CREATE THE procedure that concatenates main_text(CLOB) and title(VARCHAR2)*
CREATE OR REPLACE PROCEDURE CONTENT_TRANS_PROC( p_id in rowid, p_lob IN OUT clob)
IS
BEGIN
FOR c1 IN (SELECT main_text||' '||title data FROM content_trans WHERE ROWID = p_id)
LOOP
dbms_lob.copy( p_lob, c1.data,
dbms_lob.getlength( c1.data ));
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END;
--Create the user datastore*
BEGIN
ctx_ddl.create_preference( 'content_trans_datastore', 'user_datastore' );
ctx_ddl.set_attribute( 'content_trans_datastore', 'procedure', 'CONTENT_TRANS_PROC' );
END;
--Create the index*
CREATE INDEX content_trans_ot_idx ON content_trans(ORACLE_TEXT_COLUMN)
INDEXTYPE IS ctxsys.CONTEXT PARAMETERS ('datastore content_trans_datastore SYNC(ON COMMIT) filter ctxsys.null_filter section group ctxsys.html_section_group');
exec ctx_doc.set_key_type('PRIMARY_KEY');
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SELECT SCORE(1),ct.content_trans_id, ctx_doc.snippet('content_trans_ot_idx', ct.content_trans_id, 'lorem') as snippet
from content_trans ct
where contains(ct.ORACLE_TEXT_COLUMN, 'lorem', 1) > 1;
Results WITH NOT WANTED HTML TAGS:
6 1 lorem lorem qualification 2.1
6 2 lorem lorem qualification 2.1
Edited by: user13312701 on 13-Oct-2010 01:18

Need a quicker way to strip most html tag while retaining a few.

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private void stripTags(int startIndex){
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private boolean isWantedTag(String tag){
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Does anybody have a regExp that could do the job or a more efficient version on my tag stripper above?
Thanks in advance

I suggest the following template:
int copyFrom = 0;
StringBuilder sb = new StringBuilder();
while (copyFrom < text.length()) {
 int copyTo = findStartTag(text, copyFrom);
 sb.append(text, copyFrom, copyTo);
 copyFrom = findEndTag(text, copyTo + 1);
text = sb.toString();where findStartTag(String s, int offset) returns the index of the next start tag in s, starting search at offset. It should return s.length() rather than -1 if nothing is found. findEndTag is similar.
Sorry, that's obviously wrong since you don't want to remove everything between the tags, just the tags themselves. The basic idea is the same, though:
int copyFrom = 0;
StringBuilder sb = new StringBuilder();
while (copyFrom < text.length()) {
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 sb.append(text, copyFrom, copyTo);
 copyFrom = findEndOfTagToRemove(text, copyTo) + 1;
text = sb.toString();Here, findStartOfTagToRemove finds the position of the '<' character of the next tag to remove.
And findEndOfTagToRemove finds the position of the '>' character of that tag.
Edited by: nygaard on Sep 30, 2008 10:39 AM

Remove HTML tags from a string

I have a string that contains a couple of HTML or XHTML tag, for example
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For a special use case, I want to remove all HTML from that string and process only the plain text
lv_my_new_string = 'Hello World!'.
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TYPES: BEGIN OF TY_LINE,
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Hello World!
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