[jQuery] [autocomplete] How to activate autocomplete only after a certain character/string?

[jQuery] [autocomplete] How to activate autocomplete only after a certain character/string?


I have a domain textbox. I want to have an autocomplete only in the
tld (top level domain/extension) part. Like:
jquery [no autocomplete yet]
jquery. [optional autocomplete]
jquery.c
.com
.co.uk
.cc
.ac
....
I want autocomplete only after the first dot.
I know, it's easy just to separate the domain name and the tld into
two, but this is not I want.