The Rast module provides some functions for full text searching on PostgreSQL. It enables fast searching in text column(s) using N-gram indexing algorithm. For more information about the Rast, visit http://www.netlab.jp/rast/.
The The Rast module for PostgreSQLproject is a PostgreSQL Community project that is a part of the pgFoundry.
The pgFoundry page for the project is at http://pgfoundry.org/projects/pgrast, where you can find downloads, documentation, bug reports, mailing lists, and a whole lot more.