Searching for words with dot in the context index.

Hi ,
We have a context index that uses a following BASIC_LEXER
drop_preference (c_lexer_pref);
ctx_ddl.create_preference(c_lexer_pref, 'basic_lexer');
ctx_ddl.set_attribute(c_lexer_pref, 'base_letter', 'YES');
ctx_ddl.set_attribute(c_lexer_pref, 'whitespace', '()"`/');
ctx_ddl.set_attribute (c_lexer_pref, 'index_stems', 'english');
When user searches for "OAR" , oracle does not find "O.A.R'"
Can someone help me understand why oracle is not able to find the "O.A.R" when OAR is being searched.
Thanks for your help.

You need to use skipjoins to tell it to skip the periods, as shown below.
scott@ORA92> drop table your_table
2 /
Table dropped.
scott@ORA92> exec ctx_ddl.drop_preference ('c_lexer_pref')
PL/SQL procedure successfully completed.
scott@ORA92> begin
2 ctx_ddl.create_preference ('c_lexer_pref', 'basic_lexer');
3 ctx_ddl.set_attribute ('c_lexer_pref', 'base_letter', 'YES');
4 ctx_ddl.set_attribute ('c_lexer_pref', 'whitespace', '()"`/');
5 ctx_ddl.set_attribute ('c_lexer_pref', 'index_stems', 'english');
6 ctx_ddl.set_attribute ('c_lexer_pref', 'skipjoins', '.');
7 end;
8 /
PL/SQL procedure successfully completed.
scott@ORA92> create table your_table
2 (your_column varchar2(30))
3 /
Table created.
scott@ORA92> insert into your_table values ('OAR')
2 /
1 row created.
scott@ORA92> insert into your_table values ('O.A.R')
2 /
1 row created.
scott@ORA92> create index your_index
2 on your_table (your_column)
3 indextype is ctxsys.context
4 parameters ('lexer c_lexer_pref')
5 /
Index created.
scott@ORA92> select * from your_table
2 where contains (your_column, 'OAR') > 0
3 /
YOUR_COLUMN
O.A.R
OAR
scott@ORA92>

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