How to know column name (not an expression) used by function-based index?

Hi guys,
Is there any way to know exact column name used by FBI? If I correct, there is SYS.ICOLDEP$ table that has mapping between index/table columns, but I don't see how it could be uniquely joined with the rest. I know about USER_IND_EXPRESSIONS, but the task is to know exact column name, not it's expression.
This required by our so-called SQL preprocessing of DB schema update utility, which parses stmt (INSERT in our case) and should check against PK/UNIQUE key values.
Thanks!

I don't think this is possible in 10g or 11g because :
1. dictionary keeps track of column number in index and not in table
2. the expression used in CREATE INDEX is a system generated column
You would have to parse the expression from USER_IND_EXPRESSIONS:
SQL> create table t(x int, y int);
Table created.
SQL> create index fbi on t(y+1);
Index created.
SQL> column index_name format a10
SQL> column column_name format a20
SQL> column column_expression format a10
SQL> select i.index_name, ic.column_name, ic.column_position as iccn, ie.column_position as iecn, ie.column_expression
2 from user_indexes i , user_ind_columns ic, user_ind_expressions ie
3 where i.index_name = ic.index_name
4 and i.index_name = ie.index_name
5 and i.index_name = 'FBI';
INDEX_NAME COLUMN_NAME ICCN IECN COLUMN_EXP
FBI SYS_NC00003$ 1 1 "Y"+1

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OWNER                                     NOT NULL VARCHAR2(30)
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OBJECT_ID                                 NOT NULL NUMBER
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TEMPORARY                                          VARCHAR2(1)
GENERATED                                          VARCHAR2(1)
SECONDARY                                          VARCHAR2(1)
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Execute      1      0.00       0.00          0          0          0           0
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Execute      1      0.00       0.00          0          0          0           0
Fetch      160      0.01       0.01          0        698          0        2376
total      162      0.03       0.01          0        698          0        2376
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Execute      1      0.00       0.00          0          0          0           0
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