Query to extract HTML tag with data

Hi All,
I have a string.
'<HTML><HEAD>THIS IS HEAD.</HEAD><BODY>THIS IS BODY.THIS IS P1.NIMISHTHIS IS P2.</BODY></HTML>'
I want to extract a html tag including its opening & closing tab with data as
if i say P1
then the output should be
'THIS IS P1.'
for P2
then the output should be
THIS IS P2.
please help me in writing this query with regular expression
i have tried it as following but it is not giving desired result:
WITH T AS
SELECT
 '<HTML><HEAD>THIS IS HEAD.</HEAD><BODY>THIS IS BODY.THIS IS P1.NIMISHTHIS IS P2.</BODY></HTML>' STR
FROM
 DUAL
SELECT REGEXP_SUBSTR(STR, '.+P2.+') FROM T
Thanks & Regards
Nimish GargEdited by: Nimish Garg on May 7, 2012 5:49 PM

Nimish Garg wrote:
My requirement is to extract a <tag>data</tag> from a HTML/XML string
where data contains any specified value.HTML is not XML.
And that is a critical distinction to make. HTML parsing is horribly complex. XML is quite easy. For HTML you have to code your own parser in PL/SQL. XML can be parsed using the XMLTYPE class/data type in PL/SQL.
So if you need to find a single specific tag in HTML - I would not try to treat it as XML. I may not even try to use regular expressions.
I would do a basic substring search for the start of the tag. Read the data following the tag. Ensure that there are no nested or embedded tags in the data. Until the end tag is read. Because HTML is that much abused - and because that is an accepted norm as parsers used by browsers deals with that abuse without complaining.
Proper HTML is mostly a myth in my experience of "screen scraping" web servers for data extraction as they do not have web services supplying the data.

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