Set a variable field delimiter using awk

Shell Programming and Scripting
1

How can i set a variable field delimiter using awk??

I wanna do something like this ,but i can�t get the correct syntaxis :

VARI=TEST

echo "0121212TESTxvcshaashd"|awk 'FS="$VARI" {print $2}'

Thanks.

2 
echo "0121212TESTxvcshaashd" | nawk -F "$VARI" '{print $2}'
3

How nerd I am.. !!

I was trying :

echo "0121212TESTxvcshaashd" | awk -F\${VARI} '{print $2}'

And the correct thing:

echo "0121212TESTxvcshaashd" | awk -F\\${VARI} '{print $2}'

Thanks vino !