Search on a BLOB and not finding certain STRINGS...

I copied a search that Denes uses on his APEX How To Site (God I love that site) and customized it a little bit for my needs. Here's the interesting problem...
if I have a string of text within the attachment like
cgext.nfc_pacs1
the search returns with no records found. But if I only use
cgext.nfc
then I get a slew of returns. Most of them with _pacs1 and some with other extensions...
So I'm wondering, why is the search not finding the complete string that I enter into the search field when I've copied the string and pasted it into the field from a record that I know is in the Uploaded_Files table...
Any ideas?
First the Search:
SELECT ID, score (1) relevance,
SUBSTR (UPLOADED_FILE_NAME, INSTR (UPLOADED_FILE_NAME, '/') + 1) file_name
FROM UPLOADED_FILES
WHERE contains
(blob_content,
CASE
WHEN :p500_search_on_blob IS NULL
THEN 'this_text_doesnt_exist'
ELSE '%'
|| :p500_search_on_blob
|| '%'
END,
1
) > 0
Second, I made sure that I ran an index on UPLOADED_FILES
Third, I made sure that I ran a DBMS stats on the table / blob_content...
I'm at a loss as to why full text searches on strings that I know are on documents inside of the table are not finding them. Only when I cut down the search phrase does it kinda work...
Message was edited by:
mikedlong
Message was edited by:
mikedlong

I think I know what is happenening but I'm not sure why it is happening...
If I take the underscores out of the search then it will find the complete string, but why is this only happening with Underscores? Is there something that I'm missing with search logic that I should know?
I ran another search on the BLOB with the following text string that I know should have found 1 record:
CBS_USB_ACCOUNTING_LINES_TEMP
It didn't... now when I ran the search string with CBS USB ACCOUNTING LINES TEMP it found the one record.
I guess the problem is going to happen when I'm long gone from here and the person in my job is asked to run a search against cgext.po_t16_vendor_association and they forget to pull out the underscores...
Again, thanks to anyone with some information on how (if I even can) I can get the search to work as a litteral search against the blob content...
And thanks Denes... you've been credited on my work here in the application I'm building for the features you've taught me in your web page...
Mike Long

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