Special char in contains

Question

hi,
when I try to query with char like '-' or '=' it gives following error
ERROR at line 1:
ORA-20000: Oracle Text error:
DRG-50901: text query parser syntax error on line 1, column 3
The condition in the sql is like this
contains (myFILENAME,'-',1) > 0)
How can I search only with '-' or '=' char's?
ORacle version 9i windows.
thanx.
sam

Answer 1

scott@ORA92> drop table your_table
  2  /
Table dropped.
scott@ORA92> create table your_table (your_column varchar2(80))
  2  /
Table created.
scott@ORA92> insert all
  2  into your_table (your_column) values ('4 - 2 = 2')
  3  into your_table (your_column) values ('4 + 2 = 6')
  4  into your_table (your_column) values ('Test-drive before buying.')
  5  into your_table (your_column) values ('other data')
  6  select * from dual
  7  /
4 rows created.
scott@ORA92> exec ctx_ddl.drop_preference ('your_lexer')
PL/SQL procedure successfully completed.
scott@ORA92> begin
  2    ctx_ddl.create_preference ('your_lexer', 'BASIC_LEXER');
  3    ctx_ddl.set_attribute ('your_lexer', 'printjoins', '-=');
  4  end;
  5  /
PL/SQL procedure successfully completed.
scott@ORA92> create index your_index
  2  on your_table (your_column)
  3  indextype is ctxsys.context
  4  parameters ('LEXER your_lexer')
  5  /
Index created.
scott@ORA92> select token_text from dr$your_index$i
  2  /
TOKEN_TEXT
2
4
6
=
BEFORE
BUYING
DATA
TEST-DRIVE
9 rows selected.
scott@ORA92> select *
  2  from   your_table
  3  where  contains (your_column,'%\-%',1) > 0
  4  /
YOUR_COLUMN
Test-drive before buying.
4 - 2 = 2
scott@ORA92> select *
  2  from   your_table
  3  where  contains (your_column,'%\=%',1) > 0
  4  /
YOUR_COLUMN
4 + 2 = 6
4 - 2 = 2
scott@ORA92> select *
  2  from   your_table
  3  where  contains (your_column,'{-}',1) > 0
  4  /
YOUR_COLUMN
4 - 2 = 2
scott@ORA92> select *
  2  from   your_table
  3  where  contains (your_column,'{=}',1) > 0
  4  /
YOUR_COLUMN
4 + 2 = 6
4 - 2 = 2
scott@ORA92>