postgres full text search add period to parser

I am using开发者_JAVA百科 postgres full text search. I want to add period (.) to the list of parser by which words should be split. right now Hello world is split into Hello and world, but hello.world is not split at all.

Does anyone know how to add period (.) to the default parser list.

Thanks

Looks like the only way to do this it to propgramatically update the row by splitting based on .