[SQL] String Concatnation

[Najm Hashmi]

Hi,
 How can I concatnate   two varialbles, seperated by a |,  that are type text
together?
v, v1 text;
some work
then
res:= v ||''|''|| v1;
this syntex does not work in plpgsql??
Any ideas how to do it ???
Thanks.
Najm