tsearch2

The tsearch2 module provides backwards-compatible text search functionality for applications that used tsearch2 before text searching was integrated into core PostgreSQL™ in release 8.3.

Although the built-in text search features were based on tsearch2 and are largely similar to it, there are numerous small differences that will create portability issues for existing applications:

There are some issues that are not addressed by the replacement tsearch2 module, and will therefore require application code changes in any case:

The recommended way to update a pre-8.3 installation that uses tsearch2 is:

At a later time you may wish to rename application references to the alias text search objects, so that you can eventually uninstall the replacement tsearch2 module.

Tsearch2 Development Site http://www.sai.msu.su/~megera/postgres/gist/tsearch/V2/