SQL & PL/SQL

Hi.

I have a question about searching.
Is there any possibility to search inside a package (stored in the DB) for a string?

The problem is, that we have many packages (not all programmed by us) and we want to write an overview about all user specified errors (rais_application_error) with error-number and -message.

The manually method is, to search with SQL Developer each package for the string. But this would be very inefficient.

Do you know any method to search (maybe via sqlplus?) inside all packages for a string?

Thanks for answering.
Best regards.