I'm trying to get a regex expression that fills in 4 pieces of information for me.

1) Series, in this case Formula1

2) Year, in this case 2010

3) Venue, in this case Grand Prix

4) Tag, in this case:  Grand.Prix.WS.PDTV.XviD-433 2

I have a regex expression in the snippet of the bash file below, bit it is not generating any of those 4 tags as I was hoping. Any help would be much appreciated. 

Example of file being looked at by Regex

Formula1.2010.Australian.Grand.Prix.WS.PDTV.XviD-433 2.avi

Regex code and bash remap section of code:

# regex expression parse Tag information from the filename

regex="^([a-zA-Z]+)\.(20[0-9][0-9])\.([a-zA-Z]+)\.(.*)$"

if [[ $CATEGORY -eq "tv" && $NAME =~ $regex ]]; then

  show_name=${BASH_REMATCH[1]}

  season=${BASH_REMATCH[2]}

  episode_name=${BASH_REMATCH[3]}

  tag=${BASH_REMATCH[4]}

fi