> All I need to do is determine
> if a particular string ('.com') pattern exists in the
> column, within the first 75 bytes, and return its
> starting position.

The secret is the built-in DBMS_LOB.INSTR.

Haven't actually run this code, but something along these lines ought to
work:

DECLARE
   lobloc BLOB;
   rawstr RAW := UTL_RAW.CAST_TO_RAW('.com');  /* notice, case sensitive!
*/
   pos PLS_INTEGER;
BEGIN
   SELECT lobcol INTO lobloc WHERE primary_key = 'whatever';
   pos := DBMS_LOB.INSTR(lobloc, rawstr);
   IF pos > 0 and pos <= 75
   THEN
      DBMS_OUTPUT.PUT_LINE('found it!');
   END IF;
END;
/
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