Is there any oracle user_source table equivalent in postgre?

Hello,

Can any one help me if oracle like any user_source table is there in
postgre 8.4 (in pg_catalog or information_schema).
Actually we migrated code from Oracle to Postgre. Now i want to search in
how many places( i.e. in functions ) we have used a particular syntax(
e.g. current_date). This can be achieved by using data dictionary view
user_source in oracle.

thanks in advance...

Venkat
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